The sleds are different....
The different brands respond differently depending on the rider...
Rider Weight
Rider height
Type of snow
What kind of riding (trails, boondocking, jumping, climbing)
What if any mods are done
How fit and active are you? Are you an aggressive Rider?
Are you an agressive ACTIVE rider that jumps easily, all day, from running board to running board?
How much time do you spend sitting/standing?
Some people swear by thier Edge/ZX/1M/Mtn Max.... that is what they like to ride and are used to. Is it the cutting edge.. no, but if they enjoy it ... more power to you.
Also, unless you have spend multiple FULL DAYS on a sled, then you really havent "tried" it out... and that includes an hour or two here and there on your wifes or buddys sled?
When you ask someone about what they prefer... ask the above questions. Compare those answers to what you ride/weigh etc.
For example... I'm at 165-170 with all my gear on. I consider myself to be an intermediate active rider. I would NOT base my decision on what to buy on info from a 260 lb rider (w gear) that was 6'3" tall and likes to climb chutes 80% of the time... that is just not my profile as a rider.
Also keep in mind durability issues... Poo has had problems with the reliability of the 800, XP's dont take a frontal hit that well, Cat tunnels arent the strongest out there, yami's weigh more.
The weight of the sled is less issue for a Big guy, more of an issue for a smaller rider.
IMO... the top offerings from all the companies are incredible machines.