Choose a condenser microphone if you wish to make high-fidelity vocal recordings. They have an upper threshold of around 20khz, as opposed to a dynamic microphone, which tops out at around 16khz. These higher frequencies help add definition and texture to the sound. Condensers are best suited to studio work, as their extreme sensitivity means they can be damaged by dirt, moisture or impacts. High-end condenser microphones use a power supply, to reduce the amount of sound energy lost in moving the microphone plates. This "phantom power" requirement is represented in the specification info as "+48v."
Pick a dynamic microphone for live use. These lightweight hand-held units can produce high-quality sound and withstand a great deal of on-stage punishment. Since the diaphragm in a dynamic microphone is moved solely by the air pressure of the user's voice, it provides a degree of volume control. By moving the microphone closer or further away, the vocalist can create a shift in volume and presence. Conversely, a condenser mic will pick up tiny sounds you weren't aware of at the time of recording.
Consider whether you need an omnidirectional or unidirectional microphone. Unidirectional microphones pick up sound from the area directly in front of the diaphragm. This is preferable for live use, as it will pick up less of the ambient sound from other musicians, reducing the chance of feedback. An omnidirectional microphone detects sound from all directions, making it useful for recording the sound of a singer's voice reverberating in a room, or allowing vocal groups to surround it, ensuring equal exposure.