Thule... all the way, I love Thule products, I carry 3 Kayaks on my suburban, loading is simple even with 3,
I have the Hydro glide on the back rail, and the Set to Go on the front rail.
When loading the kayaks, set the kayak on the ground in line with your truck, the nose of the kayak up past the side, lift the nose in the air leaving the back of the kayak on the ground, set the nose between the two rear pads, then go to the back of the kayak, lift up to your waist and start to slide the kayak onto your vehicle, as the weight transfers to the truck it is then easy to lift the kayak higher, continue sliding forward and eventually you will be holding down on the kayak as the weight transfer is completely over the truck, let it down smoothly, the step on your bumper and slide it forward until it "sets" in the front rack. Hook up your straps and you're done.
Important rule Don't use motorcycle tie downs, when you throw them over the kayak, the hook breaks windows.... learned the hard way and cracked the windshield.
I also built little trailer wheels for the kayaks, you can see in my avatar, makes it simple to tool around the campsite with them, PVC pipes, and some pneumatic wheels from Harbor Freight for like $7 per wheel.
With this setup, I can take the kayaks from the beach to the truck, and load by myself.
Thule and Yakima each have multiple accessories for kayaks, canoes, bikes, etc. I am partial to Thule and rather dislike Yakima, but any one who has Yakima will be partial to Yakima and dislike Thule. (ford-chevy-dodge, you get the picture)
The best website: Google rackwarehouse, they carry both and a few others. Don't just take the cheapest... hence cheapest.
They also carry several types of lift assist racks, I don't find much use for them.
Also, I have had in the past the racks that tip the kayak on it's side, did not like them, you are also prone to warping the kayaks with these types alot more.
Sorry, I don't know how to post pictures yet..