Of those two buy the 8" barreled verison is price is the same then buy a solid barrel from EWKarms so you don't have vent cleaning to deal with . recoil is very mild even with the hottest of loads. Ether way you can get a non vented barrel for 59 bucks for the 6" and have ewk arms make you a longer barrel for hunting or LR matchs.
http://www.ewkarms.com/zen8/index.ph...products_id=31