Lots of other really great sci-fi out there but thought this is a fun question.
I liked the first two Star Wars (4&5). I liked most of the third (6), but the ending sucked. Star Wars 1, 2, and 3 were all bad movies. I like the newer ones. My favorite Star Trek TV series was Deep Space Nine, then the original series and Next Generation, and then Voyager. I enjoyed most of the Star trek movies.
I have been thinking about this a lot lately. I am writing a story about the future in which the characters come from a number of different worlds and galaxies. It is hard to come up with something that has not been thought of yet. So one thing I think I like about the Star Wars characters is that they seem to be more alien. I mean they seem to be more in step with different worlds and different ways of having evolved from those worlds. In Star Trek the alien creatures seem to all be of human form, they do give a reason for this in that the Galaxy was seeded by a people long ago that put their own DNA into the structure of worlds they thought would survive and grow. I would like to hear if there are any thought on this.