With mountain tyres, there’s always a trade off between speed and grip with both tread pattern and tyre thickness, so you just need to decide what your priorities are.
For a fast, racy tyre, try the Continental X King. The Bontrager XR3 and Maxxis Ardents are both good all-rounders for general trail use, and the Bontrager XR4 and staff favoutite Maxxis High Roller suit a more aggressive riding style, when grip is a priority over speed. Finally, the Bontrager XR Mud, is a condition-specific tyre for, you guessed it, mud.
Unconditional Bontrager Guarantee - all Bontrager tyres come with a 30-day trial period, if you don’t like it, return it for a no-quibble refund.