There's loads of info on this site on all the cells stated, I have the graphene 24s 10ah worth for my new project and yes they hold the volts high and perform well but I have not had them long enough to give any long term analysis, but I've had my multistars 4s 16ah cells in a 16s 16ah configuration for 2 years now they have covered around 1000 miles or so been kept at decent voltage ranges but by no way pampered and they still show 100% capacity, The key is to build a pack with enough discharge to handle your rides max discharge easy so the battery never gets much more than ambient, never discharge them below 80% or run them flat out in the cold.
I don't use bms either I prefer to live monitor the pack voltage of individual cells and run a shunt with a watthour display then when I finish my ride the cells lift straight out and go into storage I will use a simular approach on my a2b metro but with a lockable battery's box to the rear that charges on or off the bike and can be stored away from the bike or anything else then use the old fashion method for charging of rc chargers but it's never let me down yet so I say why add complexity keep it simple silly and if it ain't broke don't fix it.