It will always be Silver Age Supes for me.
The line has given me some of my favorite Batmans, as you say none of them are perfect. And I would argue for my sensibilities, I don't even think they're compatible with other characters thanks to the scaling.
Year One on paper is my favorite Batman costume and art style. I think the figure is really good. But it's tiny in comparison to the rest of the line. Cowardly Lot is a close second, but I don't like the gritted teeth, and I think he's too tall. I can't even do part swapping between the two because it's not just the height issue, everything scales proportionally and I'm not satisfied with the mix.
The Amazon three pack is fantastic, however, that is the same Batman as Lot. So for me he's too big, at least when I put him with Diana and Silver Age Supes.
Troika is also great, but not my ideal portrait, and I can't swap heads because it went back to the neck being one big piece. Hush, same issue. And they're too tall.
Re Clayface: he's a brick, but he looks cool and it does fill out that team of the era.