1. Whichever is easier to get ahold of, for you. Off-hand, I know new
ball lock kegs are available, whereas I have not seen (and have not
sought) new pin locks advertised.
2. Buy a used tank if you can find one - most of the shops just swap
tanks, so a new tank can be a total waste. Praxair, Airgas, and
Central Welding Supply all do tank swaps; CWS is reported to be the
cheapest.
3. Maybe, if you're interested in ball lock. Need to clean them, though.
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