I use Optima which in my opinion is a great battery they have more capacity and more speed in a trolling motor for same size battery. But they are expensive, I have 4 in my boat and I had to hide the reciept from momma when I got them........ I'm guessing if she saw the $1,300 reciept I would have to do an insurance claim when I came home and saw the pile of ashes from fiberglass resin. One thing they will not put up with its draining it all the way dead and keep draining it like if you had a draw somewhere, it will ruin an Optima. Its not good on other batteries either but a real killer for an Optima.
I have never used a Deka but I hear alot of good things and alot of people use them as its obvious in the first 3 posts.