will I gain anything by connecting my spdif on pc to audio interface spdif ports?
Yes, you’ll be able to hear what you’re playing before you play it 
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Thought it may be faster than usb? or more reliable
Comparing Apples and oranges…
what is SPIDIF:
What is USB:
The only advantages you will have, if you decide to use optical cabling, is to have thinner cables and the elimination of a potential hum source, because there is no more electrical contact between the devices which could cause grounding issues.
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Thanks for info guys
Cheers
If it is the PC hosting your USB audio interface, no interest.