Oscons as decoupling caps in output stage

Hi guys,

Have you tried Oscons as decoupling caps for the opamps in the output stage of a cdp?

I was swapping between the Oscons and Nichicon FGs (decoupling the OPA627) and both caps gave very different sonic signature even though they are not in the signal path.

The Oscons sounds faster, leaner and brighter. Not the nicest sound in my cdp whereas the FGs are warmer and easier going - though I lose the tightness in the lower bass region.

What are the better caps for this application?