1.DASH (Digital Cash) without hesitation. It’s a more stable cryptocurrency due to it’s lower volume. It hasn’t encountered any of the controversy of Bitcoin, yes. I don’t say that because it will, but because there’s a bigger chance something will happen as people look into it.
2.Ethereum - ETH is perceived as one of more “stable crypto’s” like BTC, mainly because it is surrounded by talented communities of developers that are actively engaging in creating value on the platform.
3.BURSTCOIN - is mined by using hard drive space. This is known as POC Mining Proof Of Capacity, also referred to as Proof Of Space. this is very easy way to start mining.
4.Gridcoin is very low on system requirements, it runs BOINC projects which do scientific research for the benefit of humanity. Although your surface wont do a lot on its own, with Gridcoin you can have many small devices contributing.
5.Monero -It is the only private cryptocurrency in use today which is truly fungible as all transactions are private and created equal. Not very hard to mine