Well, it seems clear that one should be preferred over the other through the consumer's point of view. Eurodesert has it over Heirloom hands down! Now you just need to convince Eurodesert to carry the plants you can only get from Heirloom... (Of course, I'm new to this and have no idea of what I am talking about, just the consumer's perspective...)
Edited: Oh yes, and a couple of glasses of wine too!