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.
for the best Altcoin in investment is Ripple. with the presence of Ripple that has a very stable development will be very good for the future by using the investment to generate substantial profit in the future. so for that, it would be great to use Ripple as an investment in the future.