Crud MK2s. SKS are fine if you want to stop a bit of the spray from going up your back but they dont stop it all, nor do they stop spray onto your feet, chainset/frontmech, brakes etc.
Some say they are noisy, and they can rub a little, but you wont notice unless you are riding somewhere where there is no background noise, no wind, no other riders and perfect smooth roads.
Might be worth fitting them yourself tho, they are not hard to fit and its good to know how to adjust them to keep them running free and quiet. Also worth noting if you regularly take the wheels off you need to be careful you dont break them.