I have both ventilated and raised flat, and find no discernible difference in the shooting qualities of either. Main thing for me is ....... was the gun supplied from the builder that way, or is it an add on? If it's original equipment I'm fine with it. As a personal aside, I have shot vent ribs in the field under a lot of different circumstances and have never noticed any issue with twigs, or trash of any kind, getting hung under a vent rib. For me that is more an imagined issue than a real one. YMMV.
