The pair that fits your feet.
No really, I know thats really general but, its true. I can expouse about how great Danner's or Vasque's are but, if they don't fit your feet properly, than all the hype and endorsements really mean nothing to you. Don't believe the hype!
Try out as many as possible. Getting good fitting shoes, particularly boots, is the most time consuming process when getting outdoor gear. Its also the most invaluable piece of gear. Companies such as Danner, Vasque, Montrail, Merrill, Lowa, La Sportiva, Timberlane, Asolo...... The list goes on, there are too numerous quality manufacturers out there. Just remember to take the socks you plan to wear with you when you go shopping.
If it'll make your process any easier, when I was searching for plastic mountaineering boots to climb Denali (Mt.McKinley), it took me 4 months of searching.