Star Wars has imaginative aliens
All you have to do is take one look at the amazing variety of weird and wonderful alien species in Star Wars to immediately realise just how poor and unimaginative Star Trek really is. Honestly, it's just appalling - all they do is add an extra ear, nose or random facial element and bam, there we go, a new alien species.
Take the Risians for example, they just stuck a badge on their foreheads. Bolians are no better, just human actors painted blue. The J'naii? Just humans with some wrinkles on their forehead. And don't even go there with the El-Aurians, they just look absolutely identical to humans - what a coincidence! The aliens on Star Trek are cheap and nasty.
In contrast, Star Wars has the world's best puppeteer, Frank Oz, operating Yoda, one of the most iconic aliens ever created, as well as a menangerie of wierd and wonderful beasts like Jabba the Hutt.