However, because of BitPay's influence I think the "economically winning" chain will be the one BitPay chooses.
I'd say of all companies it's Coinbase who wield the largest phallus. They have a history of being somewhat wishy washy too.
Both are important - I think the coin that BitPay and Coinbase support will win. Both have supported Segwit2x. For BitmainCoin, it is only speculation that Bitpay could support them if Segwit2x fails.
I've no idea about the various forks, but if Bitmaincoin wins out then I'm done. I didn't sign up for that. I didn't sign up for most of what's developed but that would be the final straw.
I don't like Bitmaincoin because the power balance in this chain would be greatly distorted towards the miners. But as already said the most reasonable outcome is a compromise because this way we avoid splitting the community and reducing the network effect. My favourite is a soft-forked 2MB+Segwit solution proposed in the German forum (where only new-style tx could fill the 2MB) but Segwit2x is also ok.
If there is a split, I think the "flippening" will occur instantly and even Ripple has chances to get a higher market cap than any of the 2 or 3 Bitcoin-based chains.