If you're talking straight talent, when both are 100% healthy then Simmons is better.
However, I was taking into account a lot of things in my original post, not the least of which is Simmons ACL. He may have to sit out this entire year and though I would love it if we picked him, not getting any help from your 1st round pick this season wouldn't be great.
Another thing to think about is how much did they help each other? If teams doubled Simmons, that freed up Sweat and vice versa. It was nice having both of them because teams had to pick their poison. Would love to have a similar situation with the Titans.
Also, this is just my opinion, but I think there are less impactful edge rushers than DTs in this draft, which makes them more valuable. You can get a guy like Renell Wren or Trysten Hill in the 3rd or 4th round and I don't think that drop off is nearly as big as it would be with the edge players you'd be picking at that same time.
One last thing - I had forgotten about Sweat's heart condition. I've heard that some teams have taken him off their board completely because that scares them so much. It's a shame, because watching him I haven't seen any impact to his game whatsoever. Maybe he will drop to us if that's the case!