Between the two I would actually choose BITCOIN because most of the coins are based on bitcoin and it was the first cryptocurrency that was made. For ETH, I also like how it is was made, same as bitcoin it was also based on different coins but the thing is that bitcoin has been more attractive and popular around the world and if you see the market cap it has been incredibly high and not one actually expected it would be this much. ETH is more like if you want to invest on smaller and I can see that ETH want will sooner catch up bitcoin but in general I really like both of the currency and hope I could actually invest on ETH soon.