RE: grunt call vs. doe bleat
If you are hunting the dominate buck in your area and see him I would use the grunt. It makes the impression that there is a deer in his area chasing his does. CAUTION: If you use it on a smaller buck you can scare the heck out of them, they think a big boy is comming to run them off.
The Doe-In Estrus Bleat, is to sound as a does realy close to being ready. You can call in different age group of bucks using it. Good Luck