Good for you mate. There are really people here who prefer to invest on Bitcoin only because is not only the #1 in the market but it has somewhat gain the full trust of a lot of people and the price continues to increase as we go along. While ETH is a good coin as well, bitcoin is a different animal as evident on how it grows this year.

Personally though, I hold bought but most of my investment are purely in bitcoin and a small percentage on ETH. Both of them are now mooning, so we are all happy bunny here.