Choice of compressor inlet or turbine A/R for the bigger turbos but until you go into the GT30 series and up there is usually only a few choices to make. The 500s come with the option because they are worked over stockers. The GT525s are too but I guess Z1 didn't see a market for both.
I've driven Zs with both auto and manual turbos and there isn't much difference once you start upgrading. They are pretty close to start anyway (.54 auto and .63 manual).
All of the turbos you listed are quick spooling turbos, I doubt you'd have a response problem with any of them given the standard range of supporting upgrades.