I would have to say that if you have the space and weight isn't an concern go with the "full size" BBQ tank. The 30lb's are great for heavy use but have the same problems of the 5 and 10's; you have to actually have them filled. It is great to be able to swap the tanks out without having to have to find someone to fill them. Most Home Depot stores have a 24/7 kiosk and almost every gas station exchanges. That said it is still more expensive to exchange vs. fill, but the risk of running out is lessened knowing that anywhere you can exchange.
