I have shot a few dove in the last 20 years, including six thousand in four days back in 2009, there are many more on here who have been on a trip to SA that will probally agree with me. IC/Mod is hard to beat for an oU. I have a 12 ga browning ou that is choked skeet/IC that will kill one way out if you point it in the right spot
I am going to say that the shell might matter more than the choke, a good premium load in 71/2 or 8 will help alot, those el cheapo dove loads will kill one but not as good. try a comparison sometime