One of the best in animation, history, the ability to make your own decisions, etc.
All of these things you just mentioned can all be done in Renpy. If Motkeyz had the time and interest to, he could theoretically rebuild TimeStamps in it's entirety using Renpy and it would have all of the same features. And not only would it have the same features, it would also be far less clunky, it would have more familiar controls, it would be easier to port, it'd be natively multi-platform, and it would be compatible with popular mods.
VNGine was Aesouh's proprietary custom engine. Motkeyz
cannot use it. I don't know if it's a matter of permission or familiarity but Motkeyz has said he can't use it
. Aesouh is the only guy that can finish the coding which is why TimeStamps is effectively on-hold until Aesouh's personal problems get resolved. That alone is reason enough for Motkeyz to move away from VNGine which... again... provided nothing to TimeStamps that Renpy couldn't have done.