I did a stat comparison of full Allagan and Full AF2, it's only like 4 points of Acc difference and 1 point of parry difference. If you think that's going to make or break your character then go with Allagan, otherwise go with what you want. AF2 also has 30 points of Crit which Allagan does not have so it's a wash either way.

Allagan and AF2 are sidegrades. Wear whichever one you need, personally I like the looks of the AF2 and I know I can get them with simple grinding and not having to rely on a rng drop rate.