Well, i have mixed feelings about this two designs. First of all i like them both and i wouldn't say that blakes one will win by a big margin(at least from my perspective, maybe by a slight margin). For blakes design i like combination of colors of the top green bar and logo, it fits rly well with logo, but is still question how it would look with another one.
Overall design are simple and it is probably greatest advantage of it. While other devs design, are more comlicated but i wouldn't say it is far from UI guidelines. Maybe i am using some other sort of software or idk what is wrong . From this two i would definitly choose green one(i mean two of dev designs). While if choosing from blakes and dev ones is hard to answer. As a guy who do like simple interface, and do not care about look too much, probably i would prefer blakes one. But i think it depends, and some would definitly choose devs one. Its like devs one is cool to look at, but blakes is more likely to be used.

I hope you keep work on interface and make something rly cool