Hi, I'm looking for new gear for deep diving (160-180) and I'm comparing the standart twin tanks option with a big single tank (160) with an H-valve. I believe the second option will create considerable less drag, but I'm not sure if the twins will be more reliable. The only extra situation the twins will cover is a cylinder-orin failure and only if I have a insolation manifold. The twins without the insolation have the same reliability than the single with the H-valve. I would like the opinion of more experience divers about this two options? Thanks
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