Depends what car you are running.
I have developed and sold over 100 of a special OBDII gauge for the
Honda G1 Insight and HCH1 Civic hybrid which allows access to a huge range of parameters and features including changing the SOC and clearing IMA codes etc etc.
http://www.insightcentral.net/forums/202455-post1.html
The list of supported items it can display at the moment for the G1 Insight is
IMA All Cars
00 "Wam","W Phase Amps +/-310A"
01 "Vam","V Phase Amps +/-310A"
02 "Uam","U Phase Amps +/-310A"
03 "Tam","Total Phase Amps "
04 "Mam","MDM Amps +/-250A "
05 "Mvo","MDM Voltage "
06 "Ikw","IMA Request Kw "
07 "Eto","Engine Torque "
08 "Mte","MDM Temperature "
09 "Dte","DC-DC Temperature "
0A "Bvo","IMA Battery Voltage "
0B "Mor","Motor Speed Rpm "
0C "Soc","IMA Battery Soc 16Bt"
0D "Bam","IMA Battery Amps "
0E "Bte","IMA Battery Avg Temp"
0F "Hvi","IMA HV Insulation "
10 "12v","12V Battery Voltage "
11 "Spd","Vehicle Speed Km/Mph"
12 "Soc","IMA Battery Soc 8Bit"
13 "Mto","IMA Motor Torque Nm "
14 "Isb","IMA Standby Signal %"
15 "Alf","Assist Limit Flag "
16 "Rlf","Regen Limit Flag "
17 "Bfs","Battery Fan Slow Flg"
18 "Bff","Battery Fan Fast Flg"
19 "Imt","IMA Trgt Amps 0-255A"
1A "Hvc","HV Contactor Status "
1B "Bpc","Bypass Contactor St "
1C "Iml","IMA Lamp Stat On/Off"
1D "Mpo","MPI Fan OnOff Status"
1E "Mpf","MPI Fan FastSlow Sta"
1F "Mdf","MDM Fail Flag Status"
20 "Dci","DC-DC Inhibitor Stat"
21 "Igh","Ignition Hold Relay "
22 "Igr","Ignition Hold Return"
23 "Abs","ABS Action Status "
24 "Scs","SCS Line Status "
25 "Hvr","HV Contactor Return "
26 "Bpr","BP Contactor Return "
27 "D40","IMADTC Data 16 Bytes"
28 "D50","IMADTC Data 16 Bytes"
29 "D60","IMADTC Data 08 Bytes"
2A "MCM","MCM Version Number "
UK ECM
30 "Rpm","Engine Speed Rpm "
31 "Spd","Vehicle Speed Kmh "
32 "Brf","Brake Switch "
33 "Acs","Air Con Switch "
34 "Vtf","Vtec Oil Switch "
35 "Stf","Starter Switch "
36 "Clf","Clutch Switch "
37 "Nef","Neutral Switch "
38 "Scs","SCS Open or Shorted "
39 "Fpf","Main Fuel Pump Relay"
3A "Acc","AirCon Clutch Switch"
3B "Mil","MIL Light On Off "
3C "Vts","Vtec Solenoid Status"
3D "Rfs","Radiator Fan Status "
3E "Dcf","DCDC Control Status "
3F "Aff","AFRatio Feedback Con"
40 "Imo","Imobiliser Run/Ban "
41 "Ect","Engine Coolant Temp "
42 "Iat","Eng Air Intake Temp "
43 "Map","MAP Pressure Kpa "
44 "Bar","BAR Pressure Kpa "
45 "Tps","Throttle Position % "
46 "O1c","1st 02 Sensor Cur ma"
47 "12v","12V Battery Voltage "
48 "Sov","Soc Voltage 0-5V "
49 "Eld","Electronic Load Amps"
4A "Egr","Egr Valve Feedback "
4B "Stf","Short Term Fuel Trim"
4C "Ltf","Long Term Fuel Trim "
4D "Fin","Fuel Injector ms "
4E "Spk","Spark Advance Degree"
4F "Knk","Knock Retard Degrees"
50 "Iac","Idle Air Control Vlv"
51 "Afr","AFR Air Fuel Ratio "
52 "Evp","Evap Purge Control "
53 "Mil","MIL Lamp Status 2 "
54 "Fue","Fuel System Status "
55 "Lod","Engine Load 0-100% "
56 "O2v","2nd O2 Sensor Volts "
57 "O2h","2nd O2 Sensor Heater"
58 "Cyl","Misfired Cylinder "
59 "Itq","IMA Motor Torque Nm "
5A "Bbp","Brake Boost Pressure"
5B "Etq","Engine Torque "
5C "Ikw","IMA Request +/-9.9kw"
5D "Rev","Reversing Light "
5E "Ims","IMA Standby "
5F "Stc","Starter Control "
60 "Ids","Idle Stop Control "
61 "ECM","ECM Version Number "
US ECM
64 "Rpm","Engine Speed Rpm "
65 "Spd","Vehicle Speed Kmh "
66 "Brf","Brake Switch "
67 "Stf","Starter Switch "
68 "Vtf","Vtec Oil Switch "
69 "Vts","Vtec Solenoid Status"
6A "Acs","Air Con Switch "
6B "Acc","AirCon Clutch Switch"
6C "Imo","Imobiliser Run/Ban "
6D "Mil","MIL Light On Off "
6E "Clf","Clutch Switch "
6F "Nef","Neutral Switch "
70 "Scs","SCS Open or Shorted "
71 "Fpf","Main Fuel Pump Relay"
72 "Dcf","DCDC Control Status "
73 "Ims","IMA Standby "
74 "Stc","Starter Control "
75 "Ids","Idle Stop Control "
76 "Rfs","Radiator Fan Status "
77 "Ect","Engine Coolant Temp "
78 "Iat","Eng Air Intake Temp "
79 "Map","MAP Pressure Kpa "
7A "Bar","BAR Pressure Kpa "
7B "Tps","Throttle Position % "
7C "O1c","1st 02 Sensor Cur ma"
7D "12v","12V Battery Voltage "
7E "Sov","Soc Voltage 0-5V "
7F "Eld","Electronic Load Amps"
80 "Egr","Egr Valve Feedback "
81 "Stf","Short Term Fuel Trim"
82 "Ltf","Long Term Fuel Trim "
83 "Fin","Fuel Injector ms "
84 "Spk","Spark Advance Degree"
85 "Knk","Knock Retard Degrees"
86 "Iac","Idle Air Control Vlv"
87 "Afr","AFR Air Fuel Ratio "
88 "Evp","Evap Purge Control "
89 "Evs","Evap Bypass Solenoid"
8A "Evc","Evap CVS Valve Stat "
8B "Ftp","Fuel Tank Pressure "
8C "Mis","MIL Lamp Status 2 "
8D "Fue","Fuel System Status "
8E "Lod","Engine Load 0-100% "
8F "O2v","2nd O2 Sensor Volts "
90 "O2h","2nd O2 Sensor Heater"
91 "Itq","IMA Motor Torque Nm "
92 "Bbp","Brake Boost Pressure"
93 "Etq","Engine Torque "
94 "Ikw","IMA Request +/-9.9kw"
95 "Rev","Reversing Light "
96 "ECM","ECM Version Number "
TCM Cvt Only
9C "Rpm","Engine Speed Rpm "
9D "DrR","Drive Pulley Rpm "
9E "DiR","Driven Pulley Rpm "
9F "SeR","Secondary Shaft Rpm "
A0 "Spd","Vehicle Speed Kmh "
A1 "SeK","Secondary Shaft Kmh "
A2 "DrK","Driven Pulley Kmh "
A3 "Tps","Throttle Position % "
A4 "Map","MAP Pressure Kpa "
A5 "Pnp","PNP Switch Status "
A6 "Atr","ATR Switch Status "
A7 "XXX","Spare DataBase Entry"
A8 "Atd","ATD Switch Status "
A9 "Atl","ATL Switch Status "
AA "Scs","SCS Open or Shorted "
AB "Brf","Brake Switch "
AC "Mod","Mode S Switch Status"
AD "Caa","Cas Solenoid A Stat "
AE "Inh","Inhibitor Solenoid "
AF "Cab","Cas Solenoid B Stat "
B0 "Sin","S Indicator Status "
B1 "Din","D Indicator Status "
B2 "Col","Cooling Control "
B3 "Fbl","Feedback Learn Compl"
B4 "Lcc","Learn Condition "
B5 "Sam","Starter Clutch Amps "
B6 "Ect","Engine Coolant Temp "
B7 "Iat","Eng Air Intake Temp "
B8 "Dra","Drive Pulley SolAmp "
B9 "Dia","Driven Pulley SolAmp"
BA "Rat","CVT Drive Ratio "
It also has an I2C inteface and supports the melexis infra red sensors so you can remote mount a sensior if you wanted to monitor turbo or Cat temp or something.
So for the Honda models mentioned i would say mine is better
I'm now working on extending the range to the rest of the IMA cars inc CRZ and Insight and Civic G2.