Came first doing what? Tomb Raider was totally original until it started mimicking Uncharted and ended up as an Uncharted clone with lite-RPG bloat. The next logical step is to clone open-world bloat like Horizon - which cloned AssCreed, yes.
I didn't say Tomb Raider was the original generic bow stealth collectathon trash game. Just that Horizon sure as shit isn't.
Also, UC wasn't stealth until 4. The only thing one could try to argue that TR aped from it is set pieces, but Tomb raider has had set pieces since the older entries. UC aped Tomb Raider in terms of general story and feel, if anything. If TR aped anything, it's Far Cry and AC, just like Horizon.