Deka ETX12 battery?

So after sitting in the garage for the past few months, even hooked up to a battery tender, the battery in my bike will no longer crank the motor without loosing enough voltage that the trip odometer and clock get reset. I checked it with my voltmeter and it's at 11.9 volts when the bike is on but the engine isn't running. 

I pulled the battery and noticed it is a Deka AGM battery. I believe the previous owner told me when I bought the bike that he changed the battery a few years ago, and I've owned the bike for over three years now. So I figure about six years on this battery which is great. 

The question is do I get the OEM Yausa battery, or pick up another one of these Deka batteries? They are both exactly the same price on Amazon.

Thoughts?

Both YUASA and Deka are great batteries. Flip a coin?

Just my 2c, I have a Motobatt for mine when it's ready. Read rave reviews about them, and have had it for about 2.5 years, it's sat on the shelf waiting to be installed, has only lost about 0.1v in that time!