I think the colours from the GHL Mitras will be somewhat better. The Mitras is another unit I was considering...
But: I get great colour out of my custom modified ATI Sunpower with T5/LED hybrid...So I am scared of moving over to 100% LED's. The main reason for wanting to swap over is to avoid the bulb changes, have a sleeker light unit and be able to gain some experience and knowledge regarding keeping SPS under 100% LED's. It will be a new challenge...but I dont want it if the ultimate colour cannot be obtained.
Is that unit built in with T5's or did you add DIY T5's?
I have a T5/LED combo and I love it. The coral colours are very good.