I have used about every type of call out there. I keep going back to the same two.
Knight N Hale Slate hammer and glass Hammer
I like the pot calls because you can sit there and practically not move besides a flick of the wrist and make awesome yelps,cuts, purrs and clucks
They are loud enough a TOM 400 yards away will answer, and they make the most realistic sounds.
Only time I will bring the box call now is if its really windy and I want the sound to travel.
I dont think they make the same pot calls I have, But any of the popular brands will work. I'd buy a good one, they keep it with out for years to come.
Not hard to get good with pot calls if your a beginner. Watch youtube videos, pause and try to imitate the call they make on the video. One hour you will be a pro.