For a DD, I don't think your going to find enough differences in OEM coolants to warrant switching - stick with what's already in there. With all the "weird" chemicals in coolants nowadays, some are incompatible.
If you are racing, there are several threads on coolant already. I use one of the major search engines and add "site:the370z.com" to my search string. Eg,
coolant antifreeze site:the370z.com.