Folks at Project Tamriel seem all in all to be much more professional (if you could even use that term when it comes to modding games for fun), more adept at long-term planning and more focused on results. Which fits, because they have MUCH more work to do, especially Cyrodiil team, they need to make enough assets to create basically new games in engine from scratch. TR had it easy in a way, mainland Morrowind is just more of what shipped in vanilla when it comes to assets at the very least.
It's not like any of these projects will get done of course. They will not. I estimate that Cyrodiil team will break after Skingrad at the very, very latest, Skyrim after Whiterun, and perhaps, God willing, the projects will at least touch (northern Chorrol county with Falkreath region), which will be nice.