I've owned both sets of pedals, so this is my impression of them:
Saitek:
Wider spacing than the CH pedals. Tension can be adjusted, though even at the tightest setting they felt spongy to me. No hardware issues with them in my experience.
CH (the ones I currently use):
More narrow spacing, but IMO not enough to be a nuisance. Tension cannot be adjusted, but I personally don't find that to be an issue. Some don't like the feeling the pedals give when returning them to center, but I don't find it to be an issue. They can also be configured to work as gas/brake pedals for driving games.
Ultimately, it's a matter of what's most important to you. Both are good products and have their pluses and minuses.