if I choose the ETH companion coin that I like is NEO and XRP, I see the development of NEO at this time is very good with more sophisticated system updates, which I know currently NEO is very popular in some countries and some call it the second ETH, for XRP now experiencing a period of price increase so that is a coin that is suitable for accompanying ETH
I like also ripple, because ripple is starting now to have a value and to know in the world of cryptocurrency, and i think this kind of crypto will be stable and confident in growth development of the market value of it, because their are many crypto that are very fast to be gone because of low value. I would stay away from Ripple too as it is premined and the organization holds a large chunk of the tokens