Red top if you are locating it in the passenger compartment or no sealed wall between you and the battery... that way you don't need to put it in a sealed battery box. You still need to tie it down. Just my opinion, SOMV (Stan's opinion may vary)
Well, I posted late, so I guess I might have a conflicting opinion. Last I knew, AGM sealed batteries did not need to be in a sealed container since nothing can come out even if you cut it in half. So depending on location I guess I would contact the tech line and ask if AGM batteries need to be in a sealed box.