@nektarios This is a bit like asking a foodie to tell you their favorite chocolate cake. ;-D
Both engines sound beautiful and have their special strengths. If you want an all-around reverb with character, many options for sculpting and modulation, it's Tai Chi. If you aim for crystal clear, transparent yet breathing space around your signals it's Verberate. I would see Verberate as a possible alternative for MIRacle (esp. in 3D). I'd select Tai Chi for more effect-like reverbs, or for those (rare) cases where I didn't use MIR 3D at all, for one reason or the other.
I have no strong opinion about Neoverb as I just tested it once and didn't see a gap in my setups it would fill, back then. Apart from that, it's stereo only, if I remember correctly, and this is something I try to avoid, nowadays.
HTH,