I find this interesting as well, you really can't pick one over another, not even in the slightest?
I honestly would've thought with a name like avidfilmbuff, Raiders would've been your #1.
Well for me, it's impossible to not think of Indiana Jones without thinking of all the films, even though most feel that Raiders is the only masterpiece of them all. That's actually how I feel about the Star Wars films, to me, A New Hope is the only masterpiece in the entire series, while I only like or dislike the other films. Like I said, Indiana Jones is the only series I have seen so far where I have no preference over one or the other. To me the entire series is an excellent homage to the escapist entertainments of the past and does a fantastic job of blending many different genres together.