I have owned/own all three and at the sane time so it was easy to compare on a day to day level and not from memory.
I feel all three are equally great saddles and each shines in certain aspects. that being said i feel the Sequoia is very stealth, lightweight, and cool in the hot months.
the Ergo is clearly the Cadillac with supior padding, adjustability as well as bridge options, can also meet fall restraint requirements with upper harness and comfort, cant be beat for long removals. then there is the TreeMotion which took the most time to dial in and MUST be dialed in to appreciate it performance. it is the compromise or melding of the things that are great about the other two saddles all rolled into one. i could write for an hour but i suggest there is nothing better then getting your hands on these saddles to test drive and find the best for you.
if you have to have it "all in one tough [pick a different word] saddle" then I would go with the TM