Solar charging maintaining help

Thanks for the replies. Im still green when it comes to solar but Im reading enough that its making me want to dive head first into being as solar efficient as possible. I have another question. In learning how mppt works it sounds like its way way better for actually recharging a battery bank. Do the mppt controllers work like a good 3 phase type float charger and if I have 12v panels on the roof in series with a mppt isnt that going to be way better than my roof panels wired parallel with a pwm controller? I have 2 group 31 agm batt's and would like to get as close as possible to never have to worry about charging with the genny or ruining my batt's. If a mppt would always be a better choice to try and achieve those goals Ill opt for the mppt. Are 24v panels a better choice than 12v if your using mppt? THANKS!!!!!!