I was trying to think about any examples where I preferred a 3rd party version over an officially released figure, and I can't think of anything in the post-MP10 world. I do think Apollyon is a big improvement designwise over MP-5, though it has quality issues. One figure where we may get a 3P winner in my eyes is whenever we see the full reveal of FansToys' Grimlock. So I also treat them as placeholders in general. Though I'm not sure Takara could do better than FansToys with some of their figures, like Hound and even the maligned Perceptor (which I personally think is great). But I would love to see them try.I'm fine with 3p. But to me they are just placeholders until the real thing comes out.
There hasn't been one single instance in which I would've preferred any 3p figure over an official one.
I think it's certainly a testament to Takara's designs that we haven't seen any 3rd party yet that I know of attempting an MP style Prime since MP-10 came out. As that's the flagship Transformer.