I've been working with WordPress for about five years and would like to expand into Joomla or Drupal. I looked at each about three years ago and they both looked like a mess and appeared to be difficult to learn.

I'm looking for opinions from people who are programmers or designers who work with both of these systems.

Which is easier to learn?

Which is easier to customize?

Which has more plugins?

Which has the easiest template system to work with?

Any problems with either?