Digitbyte is not decentralized as Bitcoin.
Digitbyte has an owner, have you ever thought about it? Jared Tate.

Digibyte is only faster because it has a 15 second blocktime (instead of 10minuted), which bitcoin decentralized community decided is not good for bitcoin, but Jared think it js.
It is faster also because nobody uses their Network, so it is not congestioned.

Security is crappy also, because it uses pow and bitocin hashing power is much much bigger. This coin could be 51% easily. Bitcoin is resistant against a continental attack, because you need a continental energy to 51% it.

So all in all, if you are only worried about scalability, use visa.