I'll wander out here first.
I voted for d6 because of what I remember getting out of it when I played it way back when: a lot of fun. I bought it when it came out in '87 and had a great time with it, playing it regulary for a few years, then sporadically for a few more. I've played it twice in the last few years and the system definitely shows its age - it's not as rigid as older systems, but it's certainly not a modern narrative-heavy ruleset.
I played d20 and it was...not good. The system of levels simply did not match the story needs of Star Wars.
FFG has got some great rules, books, and stories going for their game, but I found myself a little put off after a while by the crunch factor. I have the EotE beginner box and the main book, and I actually prefer running just the rules from the box - things tend to move faster and there's not such a need at the table for everyone to be really clear on all the rules. I never had that problem with d6. I'll still run it, though.
Those are my thoughts.