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I have had the same Interstate battery in my 68 since 2006. The car is only driven from March through November, and maybe 50 miles during that time period. No battery disconnect or tender. Starts like a champ every Spring.
I'm surprised nobody mentioned Delco! No matter how much or how little I pay for a battery, I've never had one outlast the original. Delco batteries aren't cheap but they're very good
3 year old replacement GM Delco battery in my Sierra 1500 - left me stranded 2 times last week @ work during a cold snap. Slow charged it both times back @ home - did a load test on it after stranding me a second time and it failed. Not holding the charge. For the price - wish I would have got more than 3 years out of it. Maybe a dud.