Red Dragons vs. Emerald Green

[blueshrike]

Currently using Emerald and love them, however I've decided I want to try Red - they would still get buffs and seem like their attack skills and health might be a good tradeoff for the mana leach and pull/no-retaliation ability of the Green.

The problem is that I'm suddenly finding lots of greens on Elon but no reds. I believe I've opened up all islands too but haven't been down in all dungeons yet - any place where Reds usually are found?

Also, what are your thoughts on Green vs. Red?