If you want the ultimate fast, the 7500XL, b/c it has gears, and the ability to go fast and tow stuff at low speed without melting stuff, abusing batteries or requiring an absurdly high amp controllers should be reason enough to go for the mid-drive. But to me the 3000W is a better blend of power, speed, driveability, and efficiency...
For ease of install, its up to your skills, I got the mid-drive install process down to a science and have all the tools, so for me installing another one is real easy.
As for reliability, I commute to work everyday on my trike on the road, snow, rain or shine: 7200 miles, 1 3/4 years (and counting) without ever breaking down, or better yet, since I've built this trike I've never required a ride home or be rescued while stranded. Never. And if you want speed, what about 30mph average commuting speeds for fast?
As for Inglewood .... well, while fun, no one should be planning riding on the highways, I built mine to have a 60+ mph top so I could ride at 30mph comfortably around town without having the sense that I am at the ragged edge; I definitively never built mine to showcase on YT blatantly illegal things like riding on a highway at speeds that are, simply put, dangerous for bicycle grade gear, and where there are clear signs "no-bicycles"; again, this is all fun and games until someone gets hurt. No matter how much anyone wants to believe their bicycle with 7.5kW or 10, or 20kW is a motorcycle: it simply ain't, components ain't the same, especially brakes... and no amount of power is going to change that.
Here is my Cyclone 3000W powered A-1 e-trike, finally with all its stage #2 bodywork done in molded plastic, no more temp stuff...

all in preparation for its second winter, and hopefully by next year this time it'll have close to 14,000, 100% reliability rate, miles on the clock.
Enjoy!
Stage #3 aero package has already begun, I plan on doing more work on the body for a winter configuration... maybe even closed cockpit, who knows...
G.