I'm not comparing the books in terms of sci-fi, but the in terms of feeling of joy I get from being sucked into an amazing plot. HGTG has great lines, but the plot in EG just grabs on like a leech and won't let go until you're done.
Ender's Game is a really great book. In fact, it's my #1 favorite fiction book. But I don't really know that any comparison is merited between it at HGTG; they're just so different. I just like the unique writing style of Douglas Adams, even if the stories he tells with it are ridiculous and inane.
I mean, who else would come up with similes like "the ships hung in the air in much the same way that bricks don't" or "the machine provided him with a plastic cup filled with a liquid that was almost, but not quite, entirely unlike tea." I like the little language curveballs like that, they make reading fun again. :-)
Oh, seanahan, other things in my life qualify far better as blasphemy. ;-) But it *is* odd that I've never gotten into these books--a few friends who know my reading tastes have recommended them as well. Perhaps it's time to give it another try. I like to keep an open mind. :-)
That's odd, because the first time I read them I couldn't get enough! I don't think I've ever turned pages quite as fast as the ones in this series. Five books, and it was still over too quickly. Different strokes, I guess...