New to discs. I'm assembling parts for a gravel bike, Force Axs ETap. The bike will be non technical rough roads and smooth pavement.

I have never dealt with discs. I have centerlock wheels and flat mount frame and understand that. I plan to order Sram discs in 160mm and was planning to use Sram Centerline X discs, being on a mid-pricepoint. Then I see sram marketing a more extensive disc, the Centerline XR as being for the Axs groups. Then I see the X actually listed as MTB discs... Then I see some list then as road or mountain.

​​​​​​So the real question is: what distinguishes an MTB from a road disc and should I be concerned about that?