thoughts about car battery keep hooked up OR disconnect ?

I vote for disconnecting the battery and then keeping it on a battery maintainer. The last Sears Diehard battery I had lasted 15 years (using a maintainer)and was STILL WORKING but I was beginning to think I was pushing my luck so in 2005 I bought another Diehard (the biggest and baddest one they made) and it, like the last one has never failed me. The only down side is if you have a radio that has memory wire requirements you are going to loose all of the station presets and Bluetooth pairing.