You're a wizard, Harry

Well this is going to be difficult for me, since I've only seen one of the four. But I'll take a swing at it.
Star Wars vs. Star Trek. Hmm. I guess you could say I've seen Star Trek because I've seen the newest movie, but I dunno if that counts. But I'm gonna have to go with Star Wars, even though I'm probably one of the only people that hasn't seen any of them. It's just more classic than Star Trek. Lots more people haven't seen Star Trek. But it's not a landslide; they're pretty similar (as far as I know).
Now for Harry Potter and Lord of the Rings...Well, as an avid Harry Potter fan, I'm gonna have to go with Harry. Honestly, every time I've tried to watch LOTR (4 times or so), I've fallen asleep halfway through the first movie every time. I've never made it past where they're at the gate thingy by the lake. Maybe I'll try again after some Red Bulls or Five Hour Energies. But Harry Potter is classic, if I may say so. I still remember seeing the second movie in theaters. From gasping in that theater when I saw the basilisk to crying in the theater when Dobby died and feeling the relief in the grown up scenes, Harry Potter has never ceased to amaze me.