Vented or non-vented rear disks

Whaddya think guys? I'm almost ready to buy parts to fangle up rear disks for my Warn full float kit.

Vented is more bling, but is it overkill? Front end has WJ twin piston brakes, plenty of power there.

Vented or no?

I remember hearing a coment similar to this, but about front disks. Although it was about cross drilled discs, but it might apply. If you got mud in the small drilled holes and breaked, the water and mud would not compress, thus making the brakes inefective. Dont know if its true or not, or if even applies, but might be relavent.