When investing, Im a big fan of diversification of portfolios. I believe that both Ethereum and Bitcoin offer value, albeit in different ways.
Even though Ethereum is positioning itself to become a large platform, the fact that Bitcoin is so well known makes it the first place where people invest.
I would say that diversifying is actually best when investing but, however, I don't think trading your bitcoins for ethereum is worth it. Bitcoin is already a big cryptocurrency itself, if you are intending to loose on your investment, trade your bitcoins for ethereum. I have nothing against ethereum but however, I just think that its not worth being traded with bitcoin. What more do you want? Bitcoin is getting recognised from everywhere in the world, it's most valueable than a lot of currencies. Why don't you just HOLD and HOPE?
You have bitcoins in your wallet want to convert it into ETH. My opinion doesn't do it. To compare ETH, the bitcoins has more volume, and it is more popularised all over the world. Who will enter this cryptocurrency world they first invest in bitcoins. I know in future the ETH price also increase, but bitcoins will give you more profit then ETH. Which you will choose it is left to you.