Gday Tony
Being that the QHY8L is cooled and the canon isn't I would go with the Qhy.
Whilst you will get a wider FOV from the full frame canon, the cooled QHY outweighs that IMHO.
I see you already have a modded and unmodded camera so step up to a cooled CCD (even better if you can stretch to the QHY8pro)
Jeremy
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