It was done using pro, but there are not much pro features implemented there... and it was done 3 years ago Nowadays we take much more care on loaders and on vram usage.

In short I think you should not judge a tool by the works of one or the another person, but maybe how your own work looks in one or another tool. For us its unity, but I guess more than one is really confortable with gamestudio. Good thing all of those have rather generous trials and no $ xxx.xxx price tags (y)