I have used both equimats and rubber crumb mats.
Equimats I found to be very good, offering a soft bed, they can be a bit slippery untill your horse gets used to them.
Crumb mats on the other hand, absorb quite a bit of urine, are heavy to handel and hold the smell
My friend used fieldguard mats which are also very good.
its true what people say about messy rugs and in the end I used a turnout rug as it can be hosed off.
you have to use quite a bit of disinfectant and preperation of the stable floor to get the fall right, so tht urine doesn't pool under the mats.
As for bedding I have used wood shavings and long straw.
My horse is no longer stabled but now has access to a field shelter( that he uses as a latrine

).
As and when my youngster is stabled in the future I think I would be more inclined to use either chopped straw or hemp bedding to improve on the absorbtion.
I hope this helps you