I hope you get the answers you want, but that's just a big, open ended question that could take off in many directions and never getting any clear answers.
For instance questions for your question.
- Mountain or city riding; trails, paths, single-track, XC?
- High speed, no torque, low speed mountain climbing torque?
- Legal on road and path specs, or motorcycle/moped speed and power?
- Cadence or torque sensing? Throttle?
- Integrated into the frame: Bosch, Yamaha, Shimano, Bafang Max. or a bolt on to the BB?
- Suspension; front with hardtail, FS or no suspension at all?
- Shift sensing, brake cutoffs.
- .... these are just questions I rattled off, there are many more...
Tell us more about what you want to accomplish and you might get answers that'll help. Another question I have, are you not happy with your Trek? Why? What do you wish it could do that it doesn't do well?
Getting an answer for what is the most reliable will most likely be anecdotal and not much help.
As for this question:
I know some amazing ebikes that could run rings around other bikes in the right circumstances, but I would never own one. For instance a Stromer is a great bike, but it's not going to hold up very well on the off road trails I ride.
Another question that will likely get anecdotal answers:
You might add some detail to your questions. Hop this helps, rather than frustrate.