I think Chad made an excellent response. In my experience, it depends a lot on the barrel length and the shotshell that you prefer to use.
I test a lot of different shotshells and choke tubes in, as far as I can determine, most if not all commercially available barrel types and lengths and see many differences.
There a a number of good to excellent turkey chokes and shotshells today. I have found that you don't need to spend a lot of money to get excellent results.
Thanks,
Clark