I think when it comes down to it, Watt was better.
Tyron was great, but I couldn't say he was generational. Trent Williams, Joe Thomas, and Jason Peters were all peers and all playing on the same level. (FWIW, I think all four belong in Canton, easy).
From 2012-2015, JJ Watt was doing things we've never seen before. The gold standard for 3-4 DEs before him was Richard Seymour, who had 57 sacks in his 11 season career. Watt put up 51 sacks just from 2012-14. While demolishing the run, and while swatting down passes like no lineman had. He was on a different level, not just from any D lineman in the NFL, but from any D lineman we'd ever watched. He won 3 DPOYs in 4 years.
If anything, Watt's a little overshadowed because Aaron Donald jumped in almost as soon as he'd left off, and also started doing stuff we had never seen a DL do before. I think when it comes down to it, Aaron Donald will be the greatest DT of all time. But for a four-year stretch, Watt was on that GOAT level.
Tyron's been awesome, but even your most diehard Cowboys fan wouldn't call him the GOAT. He's just not in that discussion. But when you're talking greatest interior linemen ever, Watt's 2012-20125 is in that discussion.
In the end, I don't really care that the Cowboys passed on Watt. We drafted a guaranteed Hall of Famer, and arguably the best LT in Cowboys history. I'm not going to go all sour grapes about that. We crushed that pick. It's like complaining that your 400 foot home run could've been 410 with a different bat.