I think more people will go to bitcoin cash.
The reason is positioning. I strongly suggest reading Al Ries and Jack Trout, 1981, Positioning.

Much of bitcoin value came from being "first". Most people do not bother to search. It costs to much to do a thorough search. Not too little information around, but too much. So they only sample, and end up with a list of "first", "biggest", and so on. (George Stigler was wrong about searching, in other words.)

Bitcoin was "first" and "largest". Very hard to shake that position. It will probably hold for some time yet, by the way. The problem is now that mining gives lower rewards than transaction fees and the token rose quickly enough for it to be worth it for people to look into the technicals. They don't like the details too much, given other alternatives.

So bitcoin cash, due to the name and origin, will get most market share, is what I would anticipate. ETH is being supported by large institutional players and has good ideas for use. They will end up, in some order, the top two coins for a long while. The institutional buyers of bitcoin also sold large blocks, it looks like it, and locked in their gains before the end of the year. Possibly to finance other hedges.

There are now other strong positions and they are competing.