I think Ethereum has much greater potential than Bitcoin in terms of sheer utility and market capitalization. With this disproportionate reward comes extraordinary risk.
Ethereum tries to solves a larger set of problems than Bitcoin and hence has greater utility. Ethereum is a platform and ether is the currency based on this platform. Since Ethereum is a platform, new applications and currencies can be built on top of it. New currencies can be built on Bitcoin as well, but ethereum was built with the intent of being an almost like an operating system of sorts.
Before starting to invest in any cryptocurrency read and study about cryptocurrencies. In any case, do not invest more than you are willing to lose.

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