I use Valvoline Racing Coolant (AKA Zerex Racing Coolant) in multi-metal systems. I don't bother with algaecide, but use opaque tubing and reservoirs (so no light exposure) and use distilled water. New system components get a quick rinse out with rubbing alcohol. I've never had an algae problem.
If you can't decide, why not just buy the Swiftech or Innovatek products? They've thought about what's necessary and put together appropriate packages...
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