K tanks are nice, since they last a while, but I sure do hate moving them. If you can get oxy delivered or have a pickup, that's probably not a problem (um.. unless your shop is downstairs). S tanks are much more easy to move, but usually cost more for a given quantity of oxygen. I guess Dale et al. covered all that pretty well.
Propane is so much easier to deal with. I have a few barbecue tanks and one that's twice the size, which is convenient. I usually go through 2-3 K tanks of oxy for every 4 gallons of propane.
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