My best choice would be bitcoin as it was the pioneer of all them coins and the prices would definitely pump up in the near future. My 2nd best choices are dash and eth. Most widely used coin for ICO today is Eth so it's a good indication.
For the time being, the Bitcoin is the best. but it will change if the network is still very congested.
Bitcoin should be the best coin but the fork in a row made the bitcoin is very risky. As you can see there will be next hardfork to the bticoin and that will be issued the bitcoin gold as the resulf of the hardfork.
For sure, the main coin that can still gain most of the trust for now is bitcoin looking at how far it has gone and all the things at stake.
After bitcoin, I still touch my cap for litecoin as well, even though it has just been tagging along until recently that it got a bit of a push, I will still say being the silver and bitcoin being the gold, I can still trust the 2 of them to a certain extent.
This is a crypto world and you cannot actually put all your trust on any coin, so always have some little part to be ready for the worst just in case but I am hopeful all the same.