Since the answers really do vary from person to person even in the same place, some feedback on what and where your diving is like would help, but.
I am sold on aluminum, because I am using sidemount as an infinitely extensible gas supply, and that means I carry odd numbers of tanks, (1, 2+1, 2+2, 3+2).
There is a fair bit of how to snug up tanks in that recent thread about how to mount deco bottles. (In general, and without disrespect to anyone else posting, Dive-aholic has worked through most (all?) approaches and methods and teaches them which means he has done a lot of thinking from his own personal, and also his students points of view. I would take a class from him if I could. But you and I are both far away from Florida.
I am mostly concerned with teaching tourists how to leverage what they might find in random locations, but since surf is real for me, above water security is the most key factor, thus I like the metal to fix top snap that the Dive Rite system has, as opposed to any bungie only attachment format. the fact of life with that system though is that there is some slop in the water with aluminum tanks in the water, (mostly because the bottom attachment point has to go pretty far up the cylinder, thus allowing some butt floatiness, because of the lever arm of the unclipped butt of the tank. (Which I am perfectly comfortable with)