What are your preferred tires for your bike? Stock tires that come with it? Or do you ever upgrade to a different brand or something? I often like a fatter tire, as they seem to be way better, at least for me, when it comes to actual mountain biking. But yeah, discuss your preferred tires?
For me I like to use semi slick wheels for my mountain bikes. I feel it gives me the best control overall compared to other tires. Stock tires are fine, but you can always upgrade to something much better and more reliable.
Stock tires are good for commute, but if you are looking to take it to off road or in mountain trails would advise you to get fat tires. It’s more comfortable and safer than flat tires.