I find myself using both together. I have a Wacom Bamboo. It's small and sometimes a bit rough drawing long lines in one stroke, but I've got used to it. I'm relearning how to use my Bamboo and finding that the more I find out about how to better use my photoshop the more I love my tablet. That being said, I have used a mouse more and I'm for sure more comfortable with it. I feel that it all depends on preference, and there is no right or wrong when it comes to art.

So I guess my tip would be if you get a tablet, I'd watch tutorials on how to color, draw and all that before jumping in. I have fellow artists that were frustrated at first until they got the hang of using one.