i say green.
it's not really a fair comparison with those images, because the blue all matches, and the green has blue scirra lettering, and also the minty background is very blueish, while the blue theme is completely cohesive, here's a comparison on more even footing:(maybe the background should be grey, on the green, too?)
I do think blue looks more professional. but I don't think it needs to look more professional. scirra is not going to appeal to larger corporations until down the line. scirra needs to be cool, fun, and powerful. not cold, corporate, and calculatedlucid2011-08-14 15:31:46