I would go with these:
1. ETH
2. BTC
3. RIPPLE
4. STELLAR
5. TRON
All of them will have a bright future in my opinion (DO YOUR OWN RESEARCH!).
For me i want to choose Ethereum, Ripple, Bitcoin Cash and the new up coming altcoin " Traxion " i invest that thats why i choose that token. Anyways, i believe in Traxion token because of the devepers of the project.