Iuse a lot of locator calls........all with success.......my owl call is probably so old they don't make it any more!
I also use a duck, peacock, and a few others. I use them all until I get an answer. Not every bird will respond. Same reason why I carry so many turkey calls. Not anyone of them is THE magic call. It varies. One time ti will be my box or then maybe one of the pot calls or my mouth call or a trumpet or wingbone. They all work and at times some better than others but that changes from day to day.
Most times I find the magic 'get them to gobble early' is 5 to 10 minutes before it gets light enough on the horizon. Same with roosting. The last 5 minutes of daylight seems to be the ticket.
Just some observations.
JW