Hmmm...That's heavy. (On te contrary, weight has nothing to do with it. XDDD) In all honesty....
Indiana Jones is epic, hands down. I've only seen Lost Arc and Crystal Skull, but the Lost Arc is enough to put it in the top ranks of movies. Crystal Skull fails because it messes with the whole theme of delving into the past. I mean...(SPOILER) aliens?! WTF? But I mean... Harrison Ford. A+. Theme Song. A+. Plots. A+. It's got everything. Though I will not lie, I'm not a huge action fan, just because I feel like it can get stale, though Indy usually keeps things rocking. And he was Han Solo, one of the greatest heroes of all time, so he gets a gold star.
Now, McFly... The first movie is awesome! It's hard to get tired of it. I mean I love funny twists like going to the past and having your mother fall in love with you. And your dad being a total dork. My only concern with the movie may be that at times, Marty is very Gary Stu-ish (on the other hand, Indy is a handsome, intelligent, professor by day, explorer by night... They're tied.) The second movie, while not brilliant, was enjoyable. By the third movie (which I only saw parts of) I was thoroughly sick of Marty getting his panties in a twist just because someone called him... a chicken. Come on. But otherwise, the little jabs at pop culture, and all of the 80s terminology...
I said Back to the Future. Had Indy not gone after aliens, he would have my vote, but the last movie ruined it for me. And I do enjoy some comic relief, which is jammed full in Back to the Future, but not so much in Indiana Jones.