After what I have seen the Optima's endure, I'll stick with them... I had a friend's alternator go out on him during the first day of a 2 day wheeling run, and he almost made it out on the second day (granted, he did not use his winch and he ran the night part with his lights out, but still!). I have also seen (rather consistently) Optima's last well over 6 years (12 in one case), and I have seen them completely drained and brought back to life again. Just the kind of qualities I look for on my batteries...