Store #2 sounds more correct. #1 cannot possibly know if those 2-3" nasos are males yet. Either misinformed or lying to you. Most likely, misinformed. Of course, I'm optimistic about folks.
I'd almost think that at 5", males would have at least developed the beginnings of a streamer.
I'd say get the smaller one and make it a crap shoot. Go blond if possible. More expensive though. I just got a 2 1/2" for $39 bucks though.
"Life may not be the party we hoped for but while we are here we might as well dance!"