virus vs duet: audio interface?

[Joey]

I run my virus through Spdif (fully digital connection) into a motu ultralite, and process some gear through it, usually my waldorf pulse or XT.

I would run it straight through the USB but I don't really ever use viruscontrol.

I find that processing the gear through the virus and then through spdif is much better quality than going through the ultralite's conversion.

I imagine it would be the same if you were using the virus through USB.

I've wondered for a while just how good the converters in the virus TI's really are.

as for leaving it on, I'm sure it wouldn't be bad, but I know I get uncomfortable leaving my gear on if it isnt being used.