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Matter of application. Like jda said before... HQI bulb/ballast will run at a little higher wattage and deliver more intensity.That makes it simple. Trying to catch up on MH tech in a crash course is challenging. Lots of discussion in recent years mentioning XYZ is being discontinued etc.
Back in the day I used 10k giesemann bulbs and didn't really think about anything else. Plug play and grow!
I'm leaning towards 10k hamilton or 14k phoenix and I'll use my $4500 worth of LED fixtures blue if needed...
In your case the HQI will work great and the Cayman will be also great!!
You will be able to run any 250W HQI bulb you want. Doesn't have to be Phoenix.