I will specifically say 600 Ace expedition sport has been amazing for me. I had a 600 Ace tundra before this with 9000 miles on it. Ran great when I sold it. There is no comparison in terms of ride, the non-pogo from end is absolutely wonderful. I have literally never wished I had the pogo. The tundra is unbelievably tippy. I mean not kinda tippy REALLY tippy. Which is ok on a 250 lb sled, not so great at 650lbs.
This is an excellent comparison of the two - not totally current but
Close enough.
https://www.dootalk.com/threads/tundra-lt-600-ace-vs-expedition-sport-600-ace-side-by-side.534238/