Depends what you are looking for as far as bucks are concerned. If you are looking to take any legal buck, try to sound like a pair of small bucks tussling vs a couple of monsters. Deer already know the pecking order, so a subordinate buck is less likely to come in knowing he may be next in line. The dominant buck might respond to either scenario. You can use a grunt tube prior, during and after rattling. And be ready as soon as you stop rattling get your bow ready! Sometimes they come in quick.
If at all possible have a buddy rattle for you, especially if you are on the ground. The deer know exactly where that sound is coming from and will see you move. I had this happen last weekend. Not to mention the deer came from the opposite direction I was thinking they might. He snuck up to within 15-20 feet of me. When I turned to see what was behind me he saw me move and took off for parts unknown. Oh yeah he showed up within three minutes of me rattling.