Do a poll! Find out which one shoots better...that is, if you don't really have a preference for either length.
Are you just having a barrel fitted or buying the whole rifle? If it's the whole rifle, go with the one that gets you the stocks you prefer.
WHATEVER YOU DO, don't wait too long or the money will be spent and you will have to start alllllll over again. LOL That has happened to me!
Good Luck