I didn't read the complete thread now, but A7 has an major advantage,
A Giant Community, the forum is active independent from Time, and its nice documented.
Right , I have alwayes been on 3dgs side, in the past
Whenever a new engine came up, I wrote something like " Pay attention my friends, dont stick to a bloody graphic effect, stability, documentation, comunity these are the key features "
However nowadays I must admit that there are better engines around
