Go to the respective manufacturer's websites.
Find and read the applicable wireless headset User Guide/Manual.
Note any caveats, fine print, and diagrams. Plan out for yourself how the new headset will connect and work with the intended host computer/device.
What drivers (as applicable) are available?
Also look for the manufacturer's FAQ's and Forums (if any). Pay attention to what is said as well what is not said. What are people saying, asking, or complaining about?
If at all possible, go somewhere to physically examine via "hands on" the headsets in question. You may discover something that immediately is a like or dislike.
As always: check the warranty and the return (RMA) policies before purchasing.