New player: Legacy + Retaliation OR Legacy + OG.
So, if Legacy didn't exist I'd be tempted to get Retaliation.
However, I really like that Legacy is using gamebooks for the maps to reduce setup time.
The backwards compatibility with Retaliation is cool, but honestly, I think it's unlikely I'll ever exhaust the content for a single game let alone two. And if setup with Legacy's Infinity Mode is quicker, then I'm going to tend towards that.
OG Nemesis has been compared to Betrayal at House on the Hill but better, which is actually a game I enjoy, until the traitor flip happens and the ending always seems terribly anticlimatic (negating the fun build-up at the beginning.)
EDIT: also one of my pet peeves is games that feel fiddly. Granted, I don't mind playing War or the Ring, even if there's lots of pieces it doesn't strike me as fiddly.
Also apparently if you only buy the new Legacy stuff, you're getting your stuff in Q3 2028 as opposed to some stuff in Q4 2027.
So what would you pick? I mean, I could also just buy all 3...