Just wait for a little,BTC needs a big correction its too risky to buy BTC now because the price moves so fast,while ethereum facing network problems like slowed transaction speed.
If your going to invest in long term i suggest that you buy bitcoin now that the market is still in red. Bitcoin movement in the market is so unpredictable but still its the best and first coin in cyrpotoworld so it will go up eventually. Ethereum is a good choice. Ethereum in the market world is doing good because of the demands. Mang ICO is using ethereum as a platform in exchange to their token. If it will continue and the number of coin is to low but the demand of ethereum coin is high the value of it will go up eventually. So ethereum and bitcoin are best choice in investing in crypotoworld.