Litecoin, Bitcoin, and possibly xrp.
Litecoin is much faster, cheaper to send, way undervalued, and will become scarce as institutions buy it up. It also is easier to evolve with a collaborating development team and foundation.
Bitcoin, due to being the first one and recognizable, being used as a store of value as insecurity with fiat increases, etc.
XRP because if it is adopted by banks, despite having billions of coins, could become a mainstream tool for banks, etc.
Don't put down bitcoin in the race just because it has higher fees and wait time today! Well, in the 10 years literal miracles could happen. The number one reason is that, developers know the challenges today and big team must be working on solution for the same. A decades of year is huge period for any program to get upgraded to all new level. Obviously we have already seen the bitcoin's evolution in last decade and I believe more smoother future awaits the bitcoin journey. May be advance miners will be in place, may be a cloud based mining with cheaper fees and all. This could bring us to the faster transaction era and bitcoin would be choice. So yeah BTC and most of the Top 50 will make it upto a decade period without any doubts.