I don't see much use for sublimation gear now a days but it's largely personal preference. You can roughly say +1 Sublimation ~ +1 Refresh when sublimation is active and MP is not at 100%, which means you could really make a case for either, given the strategic advantages that using sublimation may offer and how frequently you're running into situations where you need to use sublimation for emergency MP before it has finished charging.
At the end of the day, I rarely run into any ohshit moments while I'm playing SCH and if I did its nothing where I would be getting huge use out of a faster charging sublimation, so I end up in refresh gear 100% of the time.