I've been using MSI Center + AB for about a year now with all my rigs and have been pretty happy. AB for OCing and its overlay and Center for the rest. My only complaint is that it updates about 1x month and it can/will reset my lighting configs. Other than that it has been doing what I need. Like crate, it's still a bundle of apps (you pick which you want) but to me, it feels more like one than when I last tried crate (about 2 years ago). Just a heads up that after an update or install it can take a bit of time (about a minute or so) to initialize but after that, it's good to go.
As far as Afterburner goes, like most of us, been using that for the better part of forever but have tinkered with Asus and EVGA's offerings but always ended up going back to it. Although EVGA's extra 1%(lol) was always fun to see with its GPUs but Precision's overlay doesn't play nice with a number of things nor does it provide as many metrics as I prefer. If it wasn't for that I'd probably use it exclusively since it can also do a majority of what I use Center+AB for.
