Only you know the answer as to whether you should get a USB microphone or a headset with a boom mic. Basically, a headset mic frees you up to move around as you please, but you’re limited to the engineering restrictions inherent in a headset mic. You can’t control the proximity effect much, adjust gain typically, or record conveniently without wearing the headset. Generally speaking, the audio captured won’t be as pristine as a dedicated USB microphone’s audio. If you’re just playing a game, get a headset. If you’re recording a podcast or a stream, you might prefer the improved audio quality of a USB mic, even if it limits your mobility.