I prefer to hold and trade with ethereum, because the transaction costs are lower and faster right now and Ethereum offers a lot more than just storing value, so it will overcome Bitcoin in the future I believe.
Both of coin are best coin. It's not easy to choose. So you will know the bitcoin prices every day. Both of the coin is every time to change. You check the coin prices list, then you choose the coin then invest. All coins is differing on the price. Its a good opportunity for the invest and get more profit. If need coin list and information, check the market places. Then you will learn more information from coin marketplace.