I suscribe to Bass and Walleye Boats mag. In articles I've read it states that gel batteries need specific charge rates (no more than 14.1 volts), compared to flooded cell batteries to get the most out of them and not damage them. Cost of gell batteries is another factor. I get the idea from the articles I've read that, if you were a professional bass/walleye fisherman and were discharging batteries 3 to 5 or more times a week then yes, the gels are the way to go as they can be fully cycled more times than flooded cell batteries. Another reason gels are good is if you have extremely limited space for batteries and have to lay them on their side, is that a problem you have?
Costco is a good way to go for your deep cycles. I've been using (abusing, neglecting) one of their batteries for three years now and it hasn't failed me yet, good price too.
Trojan bateries are supposed to be one of the best you can buy also.
If I were you Gary, I would talk to alot of people before I put down the kind of money they want for the gel cells. That means people that aren't trying to sell gels
Smj