On my fs 29er I run a butcher grid up front most of the year, it’s fantastic, pretty tacky so tons of grip but not as fast rolling as a harder compound. I ran them both ends for a summer and while the grip levels were hilarious it was pretty draggy on the flats and climbs. It’s a pretty similar design to the minion dhf/onza aquila/vittoria goma
Control casing is fine for general biking and I use them on the hardtail.
Purgatory is a good rear, not sure I’d use one on the front personally. I used butcher/purgatory for years but not so keen on the purg on the big bike out back.
If you want to enter geek territory, the butcher and slaughter grids are a tougher and heavier grid casing than the other grid casings, to suit their use in endooooro. One of the specialized tyre guys is or was active on the mtbr forums if you want to go full geek. There’s a new butcher in development as seen on jared graves’ bike. Oh and I think they’re basically maxxis tyres anyway, or same factory or something. I’m spent.