I was going to go for the sabertooth but after reading reviews it seems it doesnt go well with non top down coolers.
You can remove the "armour" for better cooling if you use a D14 or the likes, the board does have some branding printed onto the PCB that adds to it.
If im not mistaken they also OC pretty much the same, as for the UD4, i have no clue as i haven't bought a non ASUS board in 5 years
I ended up going with the P6Z68-V pro, cant give feedback on it tho as parcelforce {assholes!} still have it in their international hub . . . . . in england . . . .im in ireland >.<