For me the cost of a 360 or 320 were about the same. I went with the 320 because there have been reports that the RV9 could exceed Vne in level flight with the 360. To me this is dangerous. To those who have tons of time and are really good pilots, they can handle it. But I don't think all those who will fly my plane will be that experienced. But that is just me. Everyone makes there own choices. I chose the injected to get the most out of LOP operation; although others have reported good LOP operation with the carb and a little carb neat. YMMV.
WARNING! Information presented in this post is my opinion. All users of info have sole responsibility for determining accuracy or suitability for their use.
Dues paid 2020, worth every penny
RV9A- Status: tail feathers done less tips
Wings done less tips and avionics