Best bike case for mountain bike

So, I don’t currently own a bike case, but may be travelling with my mtn bike, and also a road bike (in the future). Is there one case better for mountain bikes over road bikes. One that is great for both so I can use it either way. I’d like to not have to break down the bike too much, as I’m not a mechanic… although I guess I fully expect to have to use a bike shop to help me put it back together at my destination.