since I have both, i'll offer up my opinions here.
-Leek: To me, the SpeedSafe AO feature and the blade shape are the main appeal. I really like the simplistic warncliffe blade shape - easy to sharped, I find it more useful than a funky recurve, etc etc. The Leek is a fantastic design. It's very light, it fits well in medium-sized hands, there are lots of variants available. Downside: they can get a bit slippery in the hand if you're sweating.
-Skyline: The Skyline is EXTREMELY light. Kershaw claims 2.3oz but I honestly think it's lighter - it simply disappears into your pocket, you'll forget it's there (don't do that when washing laundry!) It's well-designed and very well constructed; the thumb stud is place perfectly so that once the knife is good and worn in, pushing on the stud from the right angle will pop the blade open about as fast as a real assisted-open knife. The G10 handles feel GREAT in the hand, it's a sharp bugger out of the box, and with the PB washers it'll only get smoother with age.
So I'd say in the Leek's favor: looks (subjective), SpeedSafe (if you like it), tip lock (I've never found this useful), variety of models.
In the Skyline's favor: light weight, G-10 handles, VERY fast action, seems to fill the hand up better than the Leek.
I'll echo the sentiments of others here, though: Go to your knife store, handle both, and pick. After all, it's your knife, not ours! Both are very well suited to daily cutting tasks - pick whichever you like the feel of better.