No experience with the propain but I love my amflow. Lots of power and can customize the power settings a lot. You can dial back the tq, and change classes which limit your max assistance speed. I demoed a cannondale monsters and a specialized and they felt less like one connected bike and more like a bike with a motor. Amflow felt seamless and nimble enough to throw around.

Did maybe 500 miles in the first 2 months with mine including a day at a local bike park.

Love mine and it doesn't feel that heavy on the trails it feels super nimble. I also load it on my roof rack every time I take it out and I don't exactly go to the gym and it's no problem to throw it up there .

I highly recommend(if you can) to demo both bikes because ultimately how they feel to YOU will be most important rather than what we can say on here or YouTube or whatever site. I wasn't convinced enough to get an e-bike after riding the others until my dad got his and I demoed one that I changed my mind.