Many good choices
There is no single best brand but some are much better than others.
Here are independent ratings of 101 brands: http://www.Multivitaminguide.Org/
any of the top 30 on that list are good. My personal favorites include ultranutrient from pure encapsulations (not on that list!), ultrapreventive x, life force multiple, life extension mix, maxxum 4 & advanced nutritional system (on this list).