If it includes contracts (projection for Lindholm) it's Danault pretty comfortably for me.
Now...contracts aside, it's tough. Danault is a guy who should be a perennial Selke candidate. He's one of the best genuine two-way "shutdown" centers in the game while still churning out very respectable production ever year. Just rock solid and consistent. Lindholm is a solid two-way player in his own right, but Danault still has a noticeable edge in defensive impact.
Neither is a real offensive dynamo. I think individually...they're pretty comparable in that regard. In what they can really "drive" by themselves. The trick is...i think Lindholm ultimately has the significantly higher offensive "ceiling". That is...if you can pair him with the right dynamic offensive catalyst wingers, he's proven that he can elevate right along up to that #1C sort of production level. It's a bit of a unique skillset to have the ability to be "elevated" to those heights even. I don't think Danault has that. I think there's more of a "hard cap" on his skill ceiling.
So in a vacuum, without contracts considered (or the age difference)...i'd say it's a really darn good question. I think i'd lean Lindholm and hope that i have the offensive line-driving wingers to pair with him. But either way, i'm getting a really solid two-way center. The RH shot thing is almost an afterthought...but with the razor thin margin between these two, that can be a really useful thing to have in the deck for critical faceoffs, with significant relative scarcity compared to LH faceoff guys.