I think new Bitcoin users need to be made aware of the possibility of a Chain Death Spiral. If Bitcoin Cash becomes more profitable to mine than Bitcoin Core, and miners switch to mining Bitcoin Cash, then Core Bitcoin could become clogged with transactions with blocks taking longer and longer, which will make it less profitable, which forces more miners to switch, and the cycle worsens. In such a situation, it would become impossible to move your Bitcoin - you'd be stuck with a useless coin.

This can't happen to Bitcoin Cash because it has an emergency difficulty reduction mechanism built in if hashpower gets low.