It probably depends upon where you are from. If you're from a rural area that doesn't have a major shopping mall, it might be worth visiting the Mall of Millenia. But, if you have a large local mall, chances are good that the stores by you are identical of the ones there.
Theres two major outlets,Vineland and International drive,they're big,you will find what you need,but nothing that special.I suggest the Vineland location as its in a better area.Also dont get taken advantage of by paying the $10 to park in the garage,go at a less peak time when you dont have to drive around looking for a spot or park across the street by the other section where Gap,Old Navy and Fords garage restaurant are.Mall at Millenia is the nicest mall in the area,basically more high end and many stores around it.Florida mall is an older traditional mall but its huge and updated so it might be worth a visit.
Depends on your location and how far you want to travel in traffic as Vineland Outlets are fairly close to Disney and Mall of Millenia/Florida Mall are 30-45 min from Disney with traffic. Are they specific stores you want to visit? We wanted to see American Girl and M & M World so we went to Florida Mall.