I am not a fan of Gel-Cell batteries. Without going into a long explanation about their charging requirements, suffice it to say they are the poorest choice in my opinion. I am sure someone will address all the pitfalls for you but I havent had my coffee yet.
AGMs are my choice and I have been using them for over twenty years now. They are the most expensive to purchase, but are in my opinion the easiest to maintain and most trouble free, without the charging requiremants of Gel-Cell.
I will add that if AGMs are over charged and gas off they are pretty much toast, but then so are gel-cells.
