It's gotta be Raiders man..
Raiders:
+ Pros +
Nazis (and damn sinister ones at that)
First and therefore most original
The lines: "START THE ENGINES! START THE ENGINES!" and "Bad dates."
The bit when the master swordsman puts on this really smart display of swordplay and Indy just shoots him (spontaneously done when Harrison Ford was hot & tired on shooting, allegedly as he was supposed to fight him proper

)
- Cons -
Nothing comes to mind. A lot of the desert digging scenes are dragged out I think.. a real dead period when I was about 7 and watching it.
Temple of Doom:
+ Pros +
The opening music "Anything Goes"
The entire scene at Club Obi Wan
The fantastic Indy smugly closing the door of the escape plane, and the door when closed reveals that it's the people he's escaping from's plane
Shortround
The heart ripping out scene
- Cons -
No Nazis
Very limited bullwhip action
Last Crusade:
+ Pros +
Nazis
Young Indy
- Cons -
Sean Connery
Harrison Ford's dismal & unfunny impression of a "Scottish lord"
Young Indy bits are fantastic, but for him to develop a fear of snakes, get his scar and his hat was perhaps a tad unbelievable. A bit too much of an eventful day for JUNYAR if you ask me..
Love them all though. Bye.
