My opinion on 3DGS:
From A6 onward the engine went downhill due to various reasons which I don't want list in detail here. When reaching A8 it already was far from being state-of-the-art in terms of what other semi-professional engines (like Unity) could deliver. Then the development basically stalled due to dubious MMO developments and lately the Zorro project. That's why 3DGS as rather sub-par engine started to hopelessly fall behind and I don't really see why this engine nowadays would appeal to new users despite extremely rare conditions. The tools are very outdated, the featureset is "okayish" at its best and the proprietary language of Lite-C also isn't that appealing...