With knives like those, try and find a brick&mortar store where you can handle before making a purchase - BiMart, WalMart, Dicks, etc.
I own neither the skyline nor the tenacious because of how they felt in hand - the skyline was too flimsy for the blade length, uncomfortable, and ugly; and the tenacious was both uncomfortable and unsafe and awful fat (wide in both directions) for the length. Both just felt like junk, not worth the $30 tag. The Buck Vantage was (is) better than both in every respect, imho, and worth the price... But this all depends on what you are looking for in a knife, how it feels in your hand in use, and what you are willing to spend. Btw, I didn't buy the Buck because I found a deal on a Benchmade 745 Mini Dejavoo - it was 2x the price and, imho, well worth it.