Ethereum is stagnant because it's no longer profitable to mine with a GPU as it was during the summer.
Bitcoin is rising because it's about to fork.
Bitcoin is rising because it's about to fork.
We're reaching the point where it may not be possible to break even before Ethereum switches to proof of stake. Consequently, it's recently become easier and cheaper to buy gpus suited to mining.
The market is all over the place right now for mining altcoins. NiceHash-Cryptonight (pays out in BTC) will currently gross ~$18-20 a day with the same mentioned setup.