This is a difficult question to answer. It's pure guesswork. Nobody can advise what is the best option yet because nobody knows. Nobody can see into the future.
I own more EOS than DASH but I wouldn't sell my DASH for EOS because I like holding DASH. '
What I will say is I have more than doubled my EOS by speculating RAM on EOS.

One thing's for sure, EOS will not be cheap to enter into once it's had a little time to grow. If you plan on holding EOS at some point it would be wise to buy now because the way EOS has been created, if it works as planned, there won't be many EOS tokens left circulating the markets. EOS intend to launch a token leasing marketplace for dapp developers in the near future which confirms the scarcity. This scarcity will be because most tokens will be staked  and many holders will not sell to keep getting the airdrops.

If you're a developer, I highly recommend buying and holding a little EOS just to ensure you can build upon EOS in the future without having to loan someone else's tokens.
If you're just a speculator, there will always be an opportunity to earn profits within EOS if they achieve their intended goals.

Due to the predicted scarcity of EOS tokens, I estimate eos to equal Ether price within a year.