I love both colors, but if forced into a choice between the two I'd go Hella Yella only because it is more rare and stand out from the crowd. Says a guy driving a Mojito!
I wanted Bikini, I ended up with red which I do really like. I've owned yellow cars before and would take a yellow JL, or punkin, but I've decided that the blue is one of my favorites.
I'm diggin' the yellow with black trim, but if you are going to order yellow painted fenders and a matching yellow top it's a little too school bus for me.