I have a redtop on my explorer. I went with the Optima because I hooked up my audio to it. I bought it in 2004 and it still outperforms others that I have had. For example, When I got the battery, my birthday was within 2 weeks of that. I threw a party and used my 2 Memphis 15" woofers that are in the trunk, along with the rest of the speakers, as my audio for the party. I had the system on for 8 hours straight without turning it on. I accidentally forgot due to excessive amounts of fluids consumed that were not actually water..........
When everyone left, I turned off the audio, and turned on the truck as if I had never used the damn thing. Of course, after 4 years of banging of thy speakers, I cannot do the same thing anymore on the same battery. BUT, the truck does still turn on as if new. I haven't had any issue with the Optima.
By the way, the redcap is mainly used for engine use. The yellowcap is preffered for audio use. You can't go wrong with gel cell.