In my area, the Lynx Commander 900 Turbo is the #1 touring sled at the moment.
Basically the same as an Expedition:
Forged in the sparse trails and populations of Scandinavia, the Ski-Doo Expedition thrives on northern adventure and exploration.
www.brp-world.com
Lynx Rangers (~ expedition sport) are also quite popular
Some ppl still riding Yamaha RSVikings , even if its dated chassis wise, the yamaha durability and reliability is still renowned. Got some miles on one 2 years ago, used it for its purpose - pull stuff, see pic
As for the Polaris Titan, most around here want 4 strokes for touring use. S4 sees some sales but most customers in this segment wants some more HP than the S4 mill provides
I havent had a lot of seat time on those 20" sleds. Demoed a Titan 800 some years ago, found it to ride very well and being surprisingly nimble for such a big sled. Only drawback I found then was noise - lots of resonant track noise.
Also got to take an older Doo 1200 Expedition for a trip last year, found it to handle just fine.
So, I'd like to have some kind of 2up 20" sled in the stable, for long distance trips + the occasional heavy pulling tasks