I have the timberline and they really aren't the warmest imo. I would compare them to kuiu attacks but with out the vents.
I really like the pocket lay out on the timberline, suspenders and stretch.
Timberlines are legit but nothing compared to KUIU’s axis hybrids, hands down best late season pants IMO. Axis hybrids are definitely a little warmer than timberlines. Never ran the SG de havilands, but awesome reviews about them, would like to eventually.
I have the Kuiu Axis and SG Dehavilland pants. I wore the SGs for one of my late season hunts last year in November and was extremely happy with them. The Axis are too hot for me if I’m hiking. Never used the Timberlines so I can’t comment on those.
Sorry don't have experience with either but going to throw a vote in for kuiu axis. Got a pair for late season and block wind great and super warm without layers. So nice bought another pair. Sorry no help on the other 2 pants and didn't want hijack the post.