I swapped from the 2 deep cycle factory batteries to 4 Blue Top Optimas. I like them a lot.
They are smaller.
They are lighter.
They have much better (more solid and more aesthetic) mounting box options.
They are more powerful, and built to withstand a pounding.
They are expensive.
You can't find them everywhere in stock if you need one in a hurry.
Getting them into their mounting box takes a while, especially in tight quarters, (but once they are in, they are NOT going anywhere).