Beyond the deceptive name, Bitcoin Cash is at worst an honest difference in views. S2X on the other hand is being promoted with extreme levels of deception and dishonesty (like the content of this article, which states it's an upgrade rather than an incompatible replacement and claims that BU and Classic are compatible full nodes when they aren't any such thing: they don't implement any of the new under-specified S2X rules, ... they don't even implement segwit.)
> about a 2MB
You're not talking about 2MB-- 2MB is the size of blocks with segwit in effect. You're talking about 4 to 8 MB, which are above what prior research indicated was supportable even while considering a subset of considerations (such as initial synchronization), _and_ while not allowing any safety margin.
The mining community seems split between strong segwit supporters and large block supporters. Segwit alone was not able to achieve consensus and would never have activated. Segwit2x was a compromise that conceded segwit in exchange for an increase in the block size.
If the goal of the miners is to increase centralization by increasing the block size, they had the opportunity to switch to Bitcoin Cash when it forked. Note that I don't completely buy the centralization argument, especially when we're talking about a 2MB -- it's not like 1MB is some magical number handed down by Ganesh. The main risk of the increase has always been the attendant dangers of a hard cork.
I'm a Bitcoin Cash supporter, but even I'll admit that Bitcoin Cash is a direct attack on Bitcoin (Core), that was not entirely successful, although more successful than opponents thought it could be.