jrollins,
I have the Optima blue tops because I use the old batteries from my trucks for other, less critical applications.
The yellow tops and blue tops are identical batteries except for their electrical connections. The yellow tops have added side terminals, while the blue tops have the added screw-post.
I use mine in the RV, so I went with the screw-post.
Loren
P. S. I hope you know what a can of worms you've opened here asking about batteries. It's almost as bad as asking about oil.