Ripple/XRP claims to be to able to settle within 4 seconds and to be able to process 50000 transaction per second.
Classification of features
Crytpo currencies might be classified according to these features:
Cryptography method (SHA-2, SHA-3, Scrypt …)
How the blockchain is secured (Proof-of-Work, Proof-of-Stake …)
Maximum number of coins
Timespan between two adjacent blocks on the blockchain.
…
Misc
A Digital Currency Provider (DCP) is a business that keep and administer accounts for their customers, but generally do not issue digital currency to those customers directly