Outside of going to a meet and hitting a single, what is the one exercise that you know if you hit a PR on you are stronger?

For me it's full range with heavy amounts of chain (4 or more sets). I always keep track of my PR on that movement and if I hit a PR I know I'm good for a PR at the meet.

In my shirt, there is a lot more variables but typically if I'm hitting PR's off a 1brd or less I'm pretty set for the meet.

I don't usually take my heaviest straight weight singles (full range) in the gym. I think it's probably more mental than anything else but I've never felt the need. Be it raw or equipped, because of different max effort exercises I usually am pretty aware of what I'm capable of hitting in a meet.

So what exercises give you that sign?