Snowcats are all cool, and some better than others when it comes down to individual traits. Ride quality, deep snow ability, maintenance requirements, cost to own, cost to purchase, weight and size for transporting, storage or hauling capacity, parts availability, fun factor, etc.
Cider Tom says it best- determine which one fits, and then find it.
We were open to many different models, but we were most aesthetically drawn to the Sno-trac, so that became the target (I now know aesthetics are NOT a legitimate reason to choose a snowcat model, or an individual machine).
Through a vintage car trade, we ended up with a wide track Imp, and I thank my lucky stars that happened. We had dismissed the Imp in our initial cat search because the consensus of opinions talked about them like they were the "beginner" model; too small, toys, not serious enough, not cool enough, etc. I can now say "What a bunch of bull!!"
Not to say the Imp is perfect, or the best, and in fact in one case "it's the worse"
A) Category-Cab Noise Simple solution, bought headsets, now the copilot and I can talk easily with minimal noise.
Now the good traits-
Light- 2800lbs. Our lbs per sq. ft. of track is way better than most
Small- easier to haul, trailer, turn around, store, etc.
Cheap- Probably the cheapest avg. purchase price of all the cats
Parts availability- relatively few proprietary parts. Virtually everything available
Maintenance requirements- Right there with the easiest models
Now the really good traits-
Storage and Hauling capacity- We use ours for cabin access, so the average trip involves hauling friends, bags, dogs, coolers, food boxes, skis, etc. Our full- bodied Imp may look small, but it can haul a huge amount of gear, or 6 people and some gear. Try that in a Snow-trac with one back door (you can't get in to drive).
Snow ability- We can only speak for a wide track model, since it is our only experience; It is waaay better than people report on the forum. Deep snow, steeep hills, even pulling a 400lb skied trailer. Destroys the Snow-trac in this category! Faster than most other cat models, too.
Don't get me wrong, Still love and want a Snow-trac, just glad that we accidentally got the Imp instead, for it fits our situation much better. The Imp won't be popular at the vintage cat show; heck the Tuckerites can't see that far down from their citrus perch, but it is a much more worthy cat than people give it credit.
Don't know much about a Bombi, other than one awkward trait; center controls and 3 seats, which means if there are two of you, you better be comfortable looking like you're out on date night, which Glacier Sean can attest to.