I really like AGM for a trunk mounted battery. Much more resistant to leaks. It seems like a regular battery eventually leaks and I don't want to have to weld up the trunk floor for that reason.

I have run Optima's. First one many years ago did great. They had quality problems then seemed to recover. I got another a few years ago and it has been fine. The Odessy AGM is supposed to be good also but more spendy.