Haven't ever used Kosmos, but Oakridge is a very good product. Skin on or off makes no difference. Depends on how you trim. If you leave skin on, you don't have to remove it to brine. All of Oakridge products are excellent.
Smooth Smoke BBQ Team, KCBS CBJ, 2-WSM, Cajun Bandit Conversion, wsm 2880, Smokey Joe Mini wsm, Old Country offset, several kettles.