while on the majority of my toons i picked for aesthetic, e.g. not wanting a ferengi.. at all

I have an andorian a human a trill or two..
Or for any potential roleplaying i may partake in the future e.g. having a trill taken captive who eventually chooses to join the crew etc :p
But things you should look for are traits and what are more beneficial to the career choice of the boff e.g. i find 'creative/superior creative' are GREAT for science boffs built for healing, other traits to look out for could be traits like teamwork/seduce (why orions are somewhat popular)
There is a difference between 'need and greed' in the game, like there is a difference between 'need and want' in the forums