It will largely depend on what you can get your hands on. I think my stats are something like 107% mastery, 22% crit, 10% haste right now. If there’s a big chunk of mastery on a piece of gear, I’m going to take it. Not all slots can be filled by just mast/crit from the raid. So you’ll end up with some Mast/Haste or get lucky with some great mythic + items. I wouldn’t be too focussed on certain percentages. Just look at the gear (what stats are on it, which stat does it lean to – can be mastery heavy, can be haste heavy etc) and decide what you’re gonna run with.