[dogscoff]

Up to you really. I mean you could just make the aliens very human- like if you wanted to, and get the best of both worlds. It can be hard writing about an alien race, because you have to describe things which are quite normal to them but strange to us, and it keeps interrupting the flow of the story.

On the other hand, it can save you a lot of research because you can just say "ah well it's different for aliens" - for example if a character needs medical attention, you don't have to trawl medical websites looking for the correct treatment - just make something up =-)