My OE Yuasa battery is finally starting to feel a little strained starting the bike now the weather has got colder. It is just over seven years old, which I reckon by anyone's standards is a good innings for a battery.
Based on how long the Yuasa has lasted and that I'm a strong believer sticking with the devil you know, rather than the devil you don't, it'll be Yuasa again. Yes, there are fancy lithium alternatives out there that'll save a few hundred grams, but they cost a lot more, are an unknown quantity regarding longevity and I can save the same weight for free by putting 22L litres in the tank rather than 23, or taking a dump before I ride!