I've owned several Minn Kota Maxxums over the years, and will continue to put them on my boats for as long as they make them. I currently run a MK Maxxum Pro 80 US, and couldn't be happier. The "Pro" designation is applied to the models that have lift assist. I've been using the "US" (Universal Sonar) part for quite some time, but recently installed an external transducer due to a new Lowrance unit. I want to test the difference between my external and US sonar transducers, so I left the cables for both run behind the new unit. I'll do some testing to see which one I like the best, and leave the other installed for backup.
I haven't had the opportunity to test the Fortrex, and probably won't get around to it anytime soon. I think MK has the perfect bow mount, so I am unsure why they even built a new mount. Supposedly, it's stronger and quieter, but I don't see how that could be possible, as they already had hit a home-run with the Maxxum.
I've used the Edge on a friends boat. It's ok, but doesn't even compare to the Maxxum mount. For what I put a boat through, I just dont see the Edge holding up as well. I'd consider it a secondary pick based on available funds. Not a bad motor by any means, but after coming from a Maxxum, I think I'd be disappointed.
The Terrova is electric steer. Some like them. I have never cared for them on a tournament boat. I want cables - instant turning. I don't want to press a button and wait for it to get around to where I want it. Again - nothing wrong with them - different strokes for different folks. I simply don't care for electric steering. Too slow for my taste. Powerdrive V2 falls under this catagory too. If I had no choice except these, I'd go for the Terrova if I had the money.
So, in order of what I'd put on the boat (money not a factor):
Maxxum Pro (+US if you want it)
Maxxum (regular)
Fortrex (after I used one to verify I like it)
Edge
Any cable driven Motorguide
Terrova
Powerdrive V2
I'll look around for some motors for you too.
All the best,
Glenn