I started with Garage Band and migrated to Logic after realizing I wanted to record more than a couple of things. I also tried Universal Audio's Luna, since I use their audio interface, but I didn't grove with it. I already had a foothold in logic, the product had less features, and I didn't figure it was worth me learning.
Logic was definitely worth learning. Lots of good tutorials out there on whatever you are trying to do.
There is little I can't do with standard Logic plugins, but I do use some others. However, sometimes I just use stock plugins. Seems like the more full featured the song, the more inclined I am to use the plugins built into Logic for most of it -- correctly or incorrectly feeling like they might be a little more efficient. I haven't thought about it too much though short of this thread.
