Fin .... but, I'd go with the group 31 (unless 7# & $20 is a deal breaker)
I use to use a group 29 Walmart battery for my trolling motor (42# thrust 12v) on my 16' ProCraft w/90Merc and it never failed to run me around the lake all day. I would have gotten a group 31, but they didn't have any at that time. Currently using a 68ah AGM, that I originally bought to run my Livescope setup, but moved it to the TM when I got a Lithium 50ah for the LS setup.