What I recommend before your first ebike purchase is to go to you local electric bike shop and test ride everything you can.
Fat tyre bikes are awesome, I love mine. I'm a similar weight to you and my ebike has a 500 Watt hub motor. Ebikes are just as fun as riding a motorcycle, you wont regret your purchase which ever bike you decide!
My bike is hub driven with the downside being take off torque and hill climbing, but it is still a very viable option. Mid drives are cool because you can use the gears on the bike. The downside is that all the power goes through the chain so the chain is the weakest link so to speak. Mid drive ebikes have better weight distribution when compared with a hub driven ebike, since the electric motor is in the centre of the bike rather than on the front or rear hub.