Id go with a Can-am 1000 Max Commander, talk about fun!! Ive got a 2011 Can-am Outlander 800 XTP atv, and have had no issues, and really like it. 71hp of FUN. Oh yeah, that Rotax V-twin sounds amazing.
Not sure how many passengers you need to haul but I added a rumble seat to mine and a roll cage on the back and I can now haul me, my wife, and my 3 kids, and when I am riding alone the rumble seat comes out and the dump bed also still dumps with the role cage on it.
Prob depends on ur riding type. I wanted a can am just because it's a beast but settled with the cheaper vi. Underpowered- naw I may see 20mph on trails. Mainly 10mph and under in mudd and water. But if u wanna go fast. Can am.
I guess guess it depends on what your definition of underpowered means? But I watch videos of RZR 1000 fail at hills and climbs that a RZR 570 goes right up . I guess top speed would be what you want to think about. I can go 52-53 stock and I'm sure I could get more power and top end speed if I added a sheave and still spend less then a max. If of course price is a factor. Just my rambling insight. But I'm sure you will have fun with either on. Some people get envious or stuck on brand or whatever helps them sleep at night. Anything that gets me on the trails I can have fun with don't forget that part.
Sure there are days that I wish I had a yxz and a RZR ,etc but you can't have everything and it's impossible to not have fun in anything at the end of the day. Just get what you like and don't worry about what other people drive
I have the standard Viking and most of the time it's got plenty of power for whatever I want to do. The place I really notice it is climbing a hill, whether it be a steep hill on a trail or climbing up the main canyon road. I can also feel a big difference when loaded with three people and gear. I can only imagine what a larger machine with three more people in it would be like. If it were for cruising along flat trails I think it would be no problem but for what I do in our mountains, I don't think I'd be happy with a VI. And the problem with either of these two is the length and long wheel base. Too hard to wind through tight spots and too easy to high center.