For investing, I look at both brand new coins and also the more stable coins. About coins that are stable (don't confuse it with stablecoins, I'm talking about high-cap coins like Bitcoin/Ethereum), I use CoinBundle.
Unlike the crazyness of other exchanges (where are hard to place orders, and need buyers/sellers), CoinBundle is easy and done directly by the platform, without fees, and no need to build your portfolio: you invest on a portfolio (called bundles), that are: Conservative (Bitcoin, Ethereum..), Emerging (more coins), Aggressive (even more coins, if you buy it, do with caution as on Emerging bundle), Halal (comply with Islamic Finance), Coinbasic (based on Coinbase Bundle, that has been inspired on CoinBundle), and other to invest comming.
Hope you like it, tell me what do you think