Well, if you said you were going to run them for a year and probably end up buying some new kit new year just for the hell of it and wanted fit and forget, I’d probably say Shimano. If you ride local trails in the flat lands on a racing sled, then why not XTR. If you like to ride steep stuff on heavy bikes, then SLX.
However, if you want something that will last the course and you’ll always be able to get pads and seals for (as well as tiny circlips and pivots) get the Hope. If you ride somewhere really gritty, I’d say look at a twin pot system as they have more clearance than a 4 pot. I’d be more than happy to buy Hope again, but as I bought Hope last time around, I don’t need to!
If you like to scrub speed rather than control it, I’d say try Avid. As I said before, good brakes, but a little grabby for me. Not my first choice on sketchy stuff.