While ten 4* girls might be better for you right now, one 5* girl is definitely better in the long run. Personally, I'd never ever ever recommend doing 10x 5 FG rolls over one 10+1 roll since you're really just throwing a girl away, but if you're just starting out and in need of girls then 10x 4* girls is probably the better choice.

Me, I already have all 2*, 3* and 4* girls except for two, so I might do two 5FG rolls just to get the two 4* I'm missing (Sweetpea and ?????). I'm not gonna be able to save up 50 FG in time before it ends anyway... x.x

Edit: Well, if the ticket gives you a random 4* rather than letting you choose, then I'll pass. 6% chance to get the 4* I want, no thanks.