Fuel hose AN6 or AN8

I've never run a return system. However, I like the idea, I've installed some, I think there are advantages and the next one I do on something I own will probably be a return deal.

On a non-return system, fuel is deadheaded at the regulator(s). On a return system, it's constantly flowing in a big loop, with whatever is not being used at the engine being returned to the tank.
1) Not deadheading the pump takes the load off of it, runs free, runs cooler, lasts longer.
2) Fuel laying in the line under pressure doesn't have to "get moving" at the hit, it's already moving.
3) Fuel at the engine stays cooler and consistant in temperature and pressure.