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Best fat tire e-bike
1. Aventon Aventure (1st gen)

This was the best e-bike I had tested up to that point. It's off-road capable but still comfortable on the street, and the parts are premium all the way through. The price is the one real knock, but when you compare it to other bikes with the same battery and motor, $1,900 isn't bad. If you have the budget, get one, and get the green.
2. Aventon Aventure 3

This is my favorite e-bike Aventon makes, and probably my favorite e-bike in general. I'm 6'1" and about 200 lb and it fits me really well. I ride a lot of gravel now, and the fat tires plus the suspension seatpost make it feel almost like a full-suspension bike without the extra parts and cost. The 750W motor has plenty of power for any incline.
3. Mokwheel Obsidian

This is my initial review after unboxing and building the Obsidian. The dual suspension makes it really comfortable, the 1000W motor has plenty of power on and off road, and I love the styling, especially in yellow. The optional inverter is something I haven't seen from any other e-bike company: I charged one of my Toro yard tool batteries off the bike's battery, which makes this a fun pick for bike camping.
Read my full review · Check Mokwheel (code WILL30 = $30 off)
4. Aventon Aventure M

After several weeks on gravel and dirt, this is probably my favorite e-bike now, even over the Aventure 3. The mid-drive is so much more responsive than a hub motor, and in full auto, with Auto assist plus the auto-shifter, I never had to think about gears no matter the terrain. It shifted down on steep climbs and up on downhills right when I wanted. It doesn't have a throttle, and I do like a throttle, but the hill start assist covers most of that. If you're used to riding bikes and you've been on the fence, this is probably the one to buy.
5. Rattan LF 750 Pro

Overall the LF 750 Pro was really comfortable for me at 6'1", and the fat tires handled snow and dirt beautifully. I got 27 miles on a charge riding throttle only by myself, which I found really impressive. It folds into a tight package that fits a sedan, and carrying a passenger is really convenient. At $1,249 when I reviewed it, I felt the price was fair for the specs.
6. Engwe EP-2 Pro
Buy the EP-2 Pro if you need a full-size e-bike that folds small enough to go in a car trunk, and you want lights, fenders and a rear rack included. I rode mine for about two weeks. It came out of the box fully assembled, it folds in about 30 seconds, and it fit in the trunk of my Tesla Model 3.
7. Bee Cool Adventurer
Buy the Bee Adventurer if you want a dual suspension fat tire e-bike with a throttle, a rear rack and a full set of safety lights for a lot less than most full-suspension bikes. I tested mine for several weeks on roads, paved trails and rough walking trails. It was one of the most comfortable rides I'd had at the time.
Read my full review · See it at Bee Cool (not an affiliate link)
8. Mokwheel Scoria
The Mokwheel Scoria is a comfortable step-through fat tire e-bike with a big rear rack, a front fork, and a headlight and tail light. I tested it for several weeks on dirt roads and gravel paths, with no trouble. It's a good fit for commuting and getting around town.