There is no doubt Bitcoin is still the top coin. It's worth the most and the name is synonymous with cryptocurrency.
In a few years, however, it may not be the most utilized/popular. It has its issues and compared to many coins out there, it's slower and doesn't have many advantages. But it has been around for so long and a lot of other coins/exchanges rely on it to be able to buy other currencies.
This year, things will be a bit slow for crypto it seems. There are so many new ICOs, tokens and ideas coming out. The market is just being saturated and will slowly start to climb back up as these lesser coins peak and die, while the actual good coins climb back up again. Bitcoin, Ethereum, Litecoin, etc will all slowly grow and the smaller coins that have potential will grow as it's competitors die out. I'm shooting for NEO and EOS myself. Vertcoin has potential to act like Litecoin and it has a good backing and people seem to really like that one. I'm mining that one as we speak :)