Both make great poles. I used Leki's for years, including an AT thruhike and 1000 miles on the PCT. However, a couple years ago I bough Black Diamond poles, and I'll never go back to Leki. They don't slip nearly as easily as the Leki's did, and adjusting the length on them is a lot easier and faster.

So, you won't go wrong with either one, but I would recommend the Black Diamond poles.