I think I will just get both versionsUsually my deciding factor into choosing which version I play more is the version exclusives, which is a set of Pokemon that can only be found in one of the two games and needs to be traded in the other.
I think most of the version exclusives in OR/AS will be essentially the R/S exclusives carried over (such as Seedot line/Lotad line, Mawile/Sableye, Zangoose/Seviper and Solrock/Lunatone) so that will at least ease the pain. My advice would be go with the version you prefer the exclusives of.