Have also done both, mostly from a boat. Caught the biggest, and most from a boat. Wish I still had one. Just got expensive, time consuming, traffic has gotten really bad, did I mention expensive? Once you're "on" the boat, it's a lot easier to fish. Bank fishing to me, means more interaction with other fishermen, not always a good thing, but for the most part, yes.
Even though I would like to have a boat again, I won't due to the above reasons. To give me more options, and expand my range, hopefully in the near future will look more into getting a kayak.