Ethereum would be my choice because this halved price is currently very suitable for the proper investment. It is a matter of time when the market curves will start to rise and those who have invested in the influencing coins will actually earn something. There are other coins which can bring the even bigger profit over a long run but the Ethereum has proved to be a very stable coin.
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Don't look at this current red situation. It is just a delusion for the new investors and the old ones which don't have enough of the experience and are trading blindly because of the unknowledge. Investment into 1 whole Ethereum can bring you double profit in 4 months and I think that this opportunity mustn't be avoided.