[WIP] Logo Exploration

I'm working on a relaunch of my business, so I'm exploring new logos and just can't decide, which one I like best. So far I prefer the middle ones, but maybe you can help me with some feedback, so I will be able to decide.

They are all basically using my initials D/G. The right ones basically use angle brackets and slash sign to shape my initials and also relate to the development part.

What do you think? Or do you think I should restart fresh again? I'm not a logo designer.