Hey,
I'm kind of in the same situation. I got offered TGN first, then RPM (Maker studios), Tiny Galaxy (Full screen) and last Boom. I pretty much wrote TGN off straight away because they didn't seem like they would do a lot to improve my revenue and I had heard a lot of people have issues with them. Their contracts if not read correctly were a little misleading but just ask them a question and they eventually clarified my suspicions. My main issue was that as a tech reviewer I didn't want to be funneled away from there main Network HUB and into the TGN Technology HUB that only had 8000 subs. (I kind of am assuming that promotion of your videos pretty much happens via that means?) I also didn't want to loose control of my uploads and be forced to upload to the TGN page just to get better promotion.
Next was RPM. They seemed like they would get me better revenue but I was unsure of how well I would be promoted and the person who was trying to sign me would not just answer my questions and would send me useless links. They seem like a pretty plain safe offer.
I went after Fullscreen myself and got offered Tiny Galaxy which seems very small and not the major benefit of Fullscreen themselves in terms of viewers. That would be ok because there appeal was selling private advertising deals (Gorilla campaigns they call it) with you once a week for one video to earn far better revenue. I did not like the amount of control they wanted over my channel in terms of editing videos to distribute on there HUB and trying to have access to a playlist. They have been willing to compromise on some things just waiting at the moment.
Finally came BOOM. There network is revenue focused. They really don't ask much else but to put some in video advertisement shout outs and video either at start or end from what I have seen and try and get you higher paying ads. I love that my channel stays in tact I am just skeptical of how much growth I will see with my channel.
I would love to hear some feedback to help me choose. Being smaller perhaps I should go with BOOM to earn more revenue and keep building my channel as is which seems to be growing linearly with time anyways. Then when I can be accepted into a big network down the track when the size of my channel will have greater affect, do that.
Cheers