For the right conditions the sawyer would be good, but I think it would be more place specific. A katadyn is everyplace specific. If your an occasional backpacker I would think katadyn or any pump would make more sense.
What conditions are you referring to as "right"? As long as you can get water in the bag, you can filter it.
X2 only prob Ive heard of is if water freezes inside the filter. You must drain or protect from freezing.