If you think you're going to be living close to the place you rent from for a while, renting is good. The advantage of owning is you can take it anywhere....and less and less places are renting these days.
Ok. I found a place near me that leases tanks for about $50 a year with a $25 deposit with $25 for a fill. They also have 15# and 20# tanks. Would a larger tank be better? How long would a 10, 15 or 20# tank last?
For that kind of money, I'd buy the tank. Here in the Bay Area you can get a 5# tank for $65/fillled, and then refill for $12. That's a refurbished tank, but still. You can get an empty brand new tank for $85 online through beverage factory. Since hydro testing is only about $20 and only needs to be done every 5 years, it really works out cheaper to buy.