A fixed/ fixed hub is always better than a "flip flop hub" in addition to being less rubbery and not being a fashion statement with socks; you can mount a freewheel (for singlespeed) on any one or even both of the fixed sides and vice versa with fixed. In addition, if worse comes to worse in the event that you prefer fixed and the unfortunate stripping of threads happen because you're too into your studies to tighten them regularly, you always have a spare side.