First, it's important to know that paying more doesn't always mean better quality. Generic brands are often just as good as the ones with fancy advertising.
Secondly, men and women’s vitamins are necessarily created equal. Are bodies are different and they need different things to run well. Women need much more iron than men, and for that reason, women’s vitamins often contain more of it.
Lastly, it's important that your vitamin absorb well. When placed in a glass of water, a vitamin should dissolve within 30 minutes, any longer and it's not doing its job.