The POW hashing for the Ethereum ETH is at record level at the moment, it shows the miners confidence in the ETH.
The ETC hashing hate has reduced slightly.
some folks switch to the most profitable coin of the hour/day/whatever. some pools will take care of that for you, other miners just check and switch.
me, im a set and forget kind of miner, so im
still on eth. mainly cuz im too lazy.
At the moment, the Monero mining is the most profitable. It is about 30-50% more profitable to mine than ETH.