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The 30lb cylinder has a valve that can leak.
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That's certainly possible but the cure is simple. See fittings I attached to the valve in photo below. I has an o-ring in it and it will not leak; unless the o-ring disintegrates for some reason.
My preference is for the 30lbs tanks since generally they are cheaper and you can charge your system by weight with the exact amount of gas if you us a refrigerent scale.
Also with the little cans I've found it difficult to get all the gas out of the can with some remaining and therefore, wasted or released into the environment.