This is like asking about oil I just replaced my battery but I replace mine about every 3 to 4 years anyway... It is cheaper than getting out and it not cranking... I keep mine on a battery tender during the winter and if I know I am not going to ride for some time..
It is a judgement call on ur behalf.. my luck with batteries is when they decide to go they just quit.. no warning just no crank
I went with the Interstate Megatron plus, but there are a lot of good ones out there.. I have to have the sealed batteries..
good luck..