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.
Who knows, look at it uniswap right now, lately other top ten 10 alts are stronger than any crypto out there. Now another comes a new released coin and makes it to the top ten rank.
Possiblities are everywhere, but I am feeling much safer on BTC, and eth that is why I stick to them. I have sld most of my top ten coins on the market, maybe another year would come I would ok invest in others too but for now it's my comfort zone being on these two.