HELIUS: Their Cyalene or an SME IV?

I currently have an SME IV and am soon to have a Cyalene, but due to funding, will not be able to keep both for any meaningful time to do a A/B comparison. I'm torn as to which to keep and wondered if anyone has spent time with both. The arm will eventually be going onto an Oxford Crystal Reference, it has the Cyalene on there at the mo. It will fitted with a Shelter 5000 M/C. IF i were to keep the SME, how difficult would it be to fit onto the OCR ?