XRP its a centralized cryptocurrency with a unlimited supply, their ecosystem controled by bank. Imagine that with an unlimited supply, and only the company can mining/created the XRP. Better to use ETH.
Eferium its a centralised cryptocurrency with a unlimited supply, their ecosystem controlled by vitalekbutters. Imagine that with an unlimited supply, and only vitalek and friends can mining/create the eferium. Better to use XRP