I've had my All American canner for about 4 years now. This year the gauge read about 2 pounds off when it was tested (you should get a dial gauge tested at your extension office every year at the start of canning seasong) so I replaced it and the new one tested spot on. I like not having to deal with a rubber gasket also. But the All American is one of the pricier canners out there. My friend has a Presto that she picked up for about 1/3 the price of mine, and she's very happy with it.
I prefer dial gauges because I think they are more accurate, but they can get out-of-true with age or if you accidentally drop it. A weighted gauge stays accurate forever.
hmmm.. I didn't think of Presto. That's tempting simply because they're relatively local to me. Made about 40 miles from here. But I'm willing to buy a more expensive canner if it will last longer!