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I do not know much about ethereum, so take my comments for what they worth (extremely little).

Ethereum is, to some degree or other backed by THE BANKS (including JP Morgan), which just by itself makes me a little queasy.  Ethereum also performs other functions (it's designed to not "just be a currency").  I like simple things, that is, Bitcoin is meant to be used as a currency, it makes no claims to preserve copies of contracts, etc. (although there are some clever programs that somewhat have the BTC Blockchain do that).

So I will stick with BTC as long as there appears to be progress on solving the scaling problem.