The best box call is kinda hard. What ever sounds and feels best to you and also the turkey. I have yet to have the pleasure of owning a Paul's Call or a Dad's call but have heard numurous reports of greatness out of both. Have heard each will discuss with you about what you want in a call and go from there. Here are their web addy's....
http://www.paulscalls.com
http://www.dadscalls.com
I have never used a push button call but have bought a custom call from Richard Shively. It's a scratch box and is wonderful. I have also heard great things about his push button calls. Here's his web addy....
http://www.superyelper.com
Some food for thought. I usally carry three to four slate type calls into the woods. With that I carry a good many strikers. A striker will change the sound and tone of a call completey. You might want to also check into some differn't and or custom strikers. Good luck to ya'.
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