we use the older version, but planning to upgrade. Not because we need to or that we are having any problems at all. it’s more a case of doing it to keep up to date and hopefully benefit from the added new features.
Onyx 12 Production House is about 4 years old(ish), and the oldest current supported version, with all functionalities, like ICC profiling (get for making custom media profiles if your printer has a spectrometer), finishing functions for banners (grommets etc), multi printer & cutter support.
RIP Centre doesn’t have the full functions – BUT worth checking the upgrade cost to production House if new and you’d like the extras – you also get a years membership with Onyx to upgrade if new version comes out if I remember correct.