First read this article thoroughly:
http://www.medhelp.org/user_journals/show/1648102/Consider-ALL-the-Options-Before-Your-Cataract-Surgery-Working-Through-Whats-Best-For-You
There is no "best IOL" every IOL maker states they have the best, no different from every car maker. But there are lots of good automobiles and no "best" one. Same way with IOLs. My wife had cataract surgery this past year and had Tecnis AZ9003 and is delighted. You really can't make a bad choice.
Be careful of surgical offices that try and "up-sell" all the IOL surgery options. They are in every city, we have a number in Kansas City. The entire staff is encouraged, even given bonuses' to have patients spend extra out of pocket money on: "premium IOLs (toric, multifocal, accommodating, now light adjusted), femtosecond laser, ORA technology NONE OF THESE HAVE BEEN SHONE TO IMPROVE PATIENT SAFETY AND OFFER MAJOR ADVANTAGES OVER A HIGH QUALITY MONOFOCAL IOL. Almost all modern monofocal IOLs are aspherical. The toric IOL is relatively inexpensive and offers advantages for people with corneal astigmatism over a diopter who are willing to pay extra and accept a 1.5-3% chance of need a second operation to realign the toric IOL.
I recently saw in as a second opinion a patient in Kansas City that has spent $7500 PER EYE for all the bells and all the whistles and who stated he would not need glasses for anything. He did need glasses and was very unhappy and much poorer. Theses offices are VERY HIGH PRESSURE, they make you feel like a standard spheric monofocal IOL is 'not good enough for your eye". There are many seminar's and workshops that are all about how to sell people of upgrading.
Last statement THERE IS NO "BEST" IOL.