I’ve recently moved from a 2016 Yukon Denali XL (6.2) to an Ecoboost Expedition Max 3.5L. In fairness, the Expedition is reasonably new in the cycle whereas the Yukons are getting refreshed this year. That said, I prefer the Ford over the GMC in just about every possible way so far.
We had significant 6.2 issues at 70k miles (cylinder deactivation malfunction causing a top-end rebuild), the 8 spd transmission shifted hard from early days (I found out after warranty that GMC filled them with lousy fluid with high water content), the radiator needed replacing in under 4 years... the list goes on.
Given Covid we have pretty low miles on the Ford, but the ride and driving feel is vastly superior so far. The interior also has a much more solid, high quality feel as well. We have the 3.5 in the 400hp tune, but not the heavy duty tow package, and it handles a ski boat just fine (6k limit). If I had ordered it vs taking one off the lot, I would’ve gotten the tow package for the beefier 3.73 axle and I think an 8k limit.