BTC > any other coin all the times. Ethereum is platform not a coin. You can read about it on Wikipedia but we will concentrate on real stuff. Bitcoin Cash is untrusted by most people. SegWit will be still true Bitcoin, only one and SegWit will help with Bitmain's ASICBoost being taken down. So Bitmain lost his battle on Bitcoin conquer.
Ethereum is both a coin and a platform.
Bitcoin segwit is not trusted by most people in the world too, just like Bitcoin cash. Maybe a few hundred thousand people like BSegwit better than BCash, but in the grand scheme of things, it's not a big difference.
Define what is true Bitcoin, then we shall see how segwit fit? Right now segwit contradicts the title of Bitcoin whitepaper written by Satoshi Nakamoto, specifically "P2P electronic cash system". Not "settlement layer".