Antenna wide band or multi band antenna is better

Depends on your objective.

I think multi-band. Because of mobile phones (2sim gsm+cdma+gps+bluetooth). maybe. But more recent papers focus on beam steering, something like wifi wich alters beam direction to point in your phone/notebok/pad. To reduce interference, focus power, increase speed.

PIFA, IFA for multiband and it can be tuned to meet bandwidth you wanted.