There's probably not that much between the different leisure batteries. I picked up a Yuasa one from a local auto-parts place a few years ago and it's still going strong. The main thing with leisure batteries is to keep them topped up, they don't like being left flat, other than that they should last a good few years.
I'm not sure why generators have become increasingly popular, perhaps because they've gotten smaller and quieter, still not as small and quiet as a leisure battery though :P. I guess they can power more people though and can more easily last a full weekend if you need them to.
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