Plus, unicorns refuse to let you saddle them, even for space travel. Can you imagine riding bareback through a wormhole in space. Yeah, the one time I tried it I was so sore that I couldn't walk for another two weeks. Oh, and don't forget that the rainbow emissions of unicorns are toxic to the galactic environment of dark matter in space, and without dark matter... well, you know what happens.
Space velociraptors on the other hand are so much easier to deal with and they're everywhere. Honestly, they're like the Uber of galactic travel. They're fast, have reasonable prices, and they get you where you want to go safely, unless you give them a lowball tip (don't do it!). Because if you do, they may just bit your hand clean off. Just saying, don't be stingy with a raptor.
And those are my insider tips for galactic space travel. May the Force be with you.