Monero , I am suggesting Monero(XMR) when I know about monero its price was 52 and now it crossed 100$ .The market cap was $1,286,971,185 and its Volume(24h) $37,896,000. I'found in many crypto giving high views for monero . And it is also used in many exchange sites and investing which accepts bitcoin ,ethereum and litecoin too but no other cryptocoin. So ,I think Monero is best to hold now and to invest also.