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<font color='#000F22'>My view would be:-
If you want to dive twins in the future(ie do deeper longer dives) then twin 7s are fab. Mine are 300 bar and they're great and I've used them for short decos to 40m.
If you fancy getting a pony then it won't go to waste if you twin up - I'd get a 232 ali if you could as you can use that as a stage but a steel won't do you any harm either.
My preference is for side-slinging and always has been. You can switch it on and off yerself. And in a freeflow situation you could even breathe by turning on/off.
Also you could hand it off to a buddy or pass it up to the boat.
Whatever you decide getting redundancy is the main thing. How you achieve that is largely personal preference.
I don't use singles in the UK these days but I did plenty of great diving with a single and a side-slung pony.
Oh yeah - don't run inflation off it!! Please. If your inflation goes tits up then it's dive over. Inflate the BCD orally and abort.
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