Crossfuse with the Bosch drive should give better reliability then the Suntour Carrera's, the issue though is cost of system repair once you are left all but high and dry after the warranty expires. Bosch (not the only ones) leave a lot to be desired once issues occur after this initial
The Carrera's with full Suntour from top to bottom aren't too bad. It's the models that mix and match displays, controllers, etc from other brands that tend to be troublesome. The full HESC+ models generally aren't bad at all and should not be confused with the pick 'n' mix models that were responsible for most problems.
Last Summer Halfords were modestly claiming thst they were selling more Carrera ebikes in the UK than every other brand put together. According to Halfords more than 1 in 2 new ebikes are (or at least were last summer) Carrera.
Now go back over the last 5, 10, 50 pages of this forum, and count up the threads from people having Carrera trouble, and then do the same for threads from owners of other far less common brands having problems. Carrera threads are clearly in the minority, despite being in the majority for units sold.
So the reality is demonstrably quite different to the opinion that some pundits like to bandy about as "fact". Even the (relatively) more troublesome mix and match equipped models don't seem to rate threads anywhere near as often as lots of other brands, yet somehow seem to get a lot of stick that the raw numbers suggest they don't deserve.