Quoted By:
Ledian is an adorable friendly creature implied to have a mysterious link to stars (delivered in the design by making it look vaguely like an alien),
Orbeetle is a menacing looking bug-like alien inspired by action Sci-Fi and UFOs.
Which is better? Honestly depends on what you like in a Pokemon, what's your usual taste in design.
I personally find Ledian the best take on this inspiration because I usually like cuter, round designs that don't scream "the edgy twelve year old boys will love this!".
So yeah, it's Ledian for me. Bad example.