There are many different types as well at my job people are always looking for one that suits them best. The best questions you should ask yourself to help with your decision are:
1. How many pills do I want to take a day (There are one daily ranging to 6, but you have to split them up)
2. Do I want one with iron or without (Some people have issues with iron intake in their bodies, depending on the person a large amount of iron can upset your stomach, they have gentle absorption multis for that as well)
3. Am I interested in a mutli that is especially for men/women or a general multi (some have extra added ingredients, say for men theres saw palmetto for prostate health or black cohosh for women 45+ to help with menopause)
4. Lastly, do I want a multi vitamin that is whole food based (Some have extra whole foods and veggies added, theyre not in super high amounts but its decent, but they tend to be a bit more pricey)