Haven't ridden either. On paper, they match up evenly spec for spec. The only thing I saw that would cause me to "hesitate" was the IsoSpeed decoupler on the Trek. It may work and never present a problem, but I'd want more info about it, perhaps someone with the IsoSpeed decoupler on their Trek will join the conversation. Could turn out to be the deciding factor-might be great if it works as promoted--but I'm always wary of proprietary parts that could be discontinued in the future. EDIT-almost overlooked the proprietary D-fuse seatpost on the Giant--if you ride with your saddle other than perfectly straight, too bad. And if ever needs replaced, it's only available from Giant (someone correct me if I'm wrong). Guess proprietary parts on bikes are seen more often than they used to be.
Last edited by freeranger; 02-17-21 at 06:34 PM.