My Thunder 1 (non-ST) arrived with some issues that my LBS is working on (stiff handlebars that don't turn left/right freely, slightly warped front brake disc, super janky rear derailleur). Looking forward to getting it back so I can try it out properly.
I have the Gravel (cadence sensor) and just ordered a Velotric Thunder 1 (torque sensor). Both are mid-30 lbs. The Gravel definitely has that "surge from a stop" issue that cadence sensors have, and if you don't want a cadence sensor then definitely cross the Gravel off your list. It's a solid...
FYI I upgraded my 2022 (non-throttle) Gravel to hydraulic disc brakes -- it can be done but the brake lines will have to be routed externally. The two LBS I go to both tried to go internal but were unsuccessful. I also added a dropper post so there is external routing all over the place anyway...