Bitcoin and Ethereum are different, but they have a great potential in the future. Bitcoin is the greatest cryptocurrency  which is predicted to increase higher since its supply is very limited. Thus,  bitcoin price is expensive now. While Ethereum is the second largest cryptocurrency behind bitcoin. It's growing quickly,  and if we see in any exchanges, it's becoming much more used. So,  both bitcoin and Ethereum are a good choice at investing.Both are excellently rising and growing. Eth stablishes more opportunities because of bounties and other activities, btc on the other hand have great growth over the past 3 months but is limiting their activities. I'd say btc is better but i also think that eth is very open for more improvement.