In a group a wizard can do some weak CC (stun/root), snare if its needed and nuke down dangerous mobs faster. Almost everything that wizard can do, a druid can do almost as good or better with a lot of added utility. And even druids have a hard time getting groups at later levels. But still, thats the reason you see about 10 times as many druids as wizards.
If you make a wizard it should be with raids in mind where they are actually usefull.
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