It is difficult to compare these two, because they are on a league of their own. You might like the Quad display system on the OnePlus 7T Pro, but I think the OS and display performance on 11 are much better than the former. At the end of the day, it is your personal preference that matters!
Are you an Apple person? If so, go for 11. If you are used to Android and looking for an upgrade, then go with the 7T Pro.