It's a constantly moving target for me because the most interesting comics to me are the ones that are coming out contemporaneously. My favorite decade is almost always the one we're in. The "Extreme 90s" are something of an exception to the rule since I didn't really dig the aesthetic that infected all comics then and, though I'm a Batman/Superman fan for the most part, I didn't find anything to like about Death of Superman or Knightfall. It was the only time I stepped away from comics for a bit. But then Morrison's JLA brought me storming back so there's something for me to love in every decade, including the ones that occurred before I started reading comics as a toddler in the early 70s.