Regards trim, there are myriad variations, so what's worth having and what's not is going to be very much what you want from a car, some majoring on style and trim, some on the sound system, some on economy (though the consumption is very sensitive to how you drive it - I get literally double the mpg that my son does)
Regards engines, yes there 2 bhp versions, 60bhp and 75bhp or thereabouts but you need to be careful.
The two engines are identical, and the power difference is simply the software set up that effectively limits the maximum throttle opening on the lower power car. The two engines behave identically up to about 4800rpm after which the lower power car flattens off, whereas the more powerful car continues to build to the 6000rpm red line
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Whilst it sounds like a worthwhile power uplift, you only get the benefit when you're revving the nuts off of it. Checking the rev counter on ours shows that exceeding 4000rpm in everyday use is extremely rare, almost never, so the benefits of the higher power car would very rarely be realised. Torque tails off from 4400rpm on both versions, so there's a tendency to change gear before then to keep the car around peak torque, even when pressing on.
Some owners of the higher power car say they bought it for more flexibility etc on the motorway, but unfortunately the truth is it would only give them a bit more if they were redlining it on the sliproad or always cruising at about 90mph+
I'm not saying that the extra power would not on occasion be useful, but with there being far more 60bhp cars out there than 75bhp, I'd not use that as a key factor in selecting a car.