I'm not an expert but I have looked into a couple coins and liked what I saw. Those would be DeepOnion and Crypterium and I will be holding those. A couple others I am holding are Steller and Verge although I have not really looked into those. They were just cheap and my brother had mentioned them
Pick a coin, see if it has a purpose other than just being a coin, look at the website, whitepaper, roadmap, team behind it, community supporting it.