First, what are early and late Shabbos?
Early Shabbos is in the winter, when Shabbos begins early on Friday afternoon. In some of the places I've lived, Shabbos can start as early as 4pm. This can wreck havoc with your work schedule, not to mention trying to get ready for Shabbos that early! The Shabbos Shuffle (trademarked by me) is frenzied. Most people hate the getting ready so early part, but it seems that most people prefer early Shabbos overall.
Late Shabbos is in the summer, when candlelighting might be as late as 8pm. While we all appreciate the extra time to prepare for the Shabbos Queen, most people hate late Shabbos because a) You have to wait so late to eat dinner, starting at 9:30 at the earliest sometimes, and b) You end Shabbat so late on Saturday night that you can't go out and do something like see a movie.
So what is this other factor that sways my love to late Shabbos? Primarily, the Shabbat nap, aka "the Shabbos schleuf." When Shabbat ends at 5 or 6pm, there's hardly even time for a nap! Shabbat is over before you turn around. I might get to read for an hour. With shul, a meal, and then shul again, I just can't get any Shabbosing done! In short, I don't find as much peace on early Shabbats.
If you hate both early and late Shabbat, move to near the equator (::coughIsraelcough::), and you'll have Shabbat at substantially the same time year-round!