I live in Alberta too. I had an 800 renegade for riding at home and a summit for when I went to the mountains, both rev chassis. My first trip to the mountains was on my renegade actually. Both sleds work in both situations but each have their advantages.
I really loved the renegade for an all around sled with a 136 X 1.75 track. It did decent in the mountains for what it was. Having it the bar most of the time to try and keep ground speed up was key. At 260lbs plus gear it wasn't a fan of going slow without trenching till it was stuck. It worked awesome in the ditches and fields and would still hit 160 KPH in the right conditions. Easily do 100 KPH in fields, rivers and down the ditches. Could ride 99% of the year with no issues of over heating. Handled trails very well with the wider stance and good through the bumps with the rear suspension and jumping approaches. After Ian at Monster Performance did the shocks it was incredible the difference.
The summit does fine if there is decent snow or it will overheat because of the short cooler on them. Scratchers help but still have to have decent speed behind you to work. When the wife would ride my summit at home she would normally make it about 10-15 minutes before she would get close to over heating because of her slower riding pace. Gotta love the added temp gauge for that. The narrow stance does make it more playful in the snow for carving and getting on one ski. Due to my size I find the summit suspension very soft, the renegade did fade too as I beat on it but better out of the box. With some mods the summit will shine in the mountains and will be right with the XP/XM sleds. A couple more mods and they will be there with the G4 sleds too but then they start loosing their Alberta abilities.
It sounds weird to most but I find that the full length renegade cooler works better even with a track extension than a summit with the proper cooler. So an extended renegade with a summit skid and a-arms might be the perfect combo for you. My triple swapped rev renegade (stock renegade cooler with a 174") runs cooler down the trail than my 2007 880 bigbore with stock cooler (159 tunnel with a 162" track) and that both with scratchers. It works noticeably better that I have considered putting a spare renegade cooler into the summit.
I also have a set of new summit a-arms, 162 X 2.5" challenger extreme track and a 159 summit xrs skid with a big wheel kit if you decide to go that way. Probably would want the 800 engine for that tho. 600CC engine may give different results tho, all my sleds have been the 800.
Feel free to PM me if you have any questions, don't always remember to come back check.