After much research on the same subject, I opted for getting the BWoody stock length kit. Its true that the stock ones seem to have a bit of pressure on the bushings, but if you get the Bwoody with grease-able bushings, you can't go wrong they will last longer than the truck! The angle on the BWoody ones seems better than the stock ones. The extended ones will also probably work just as well .. so for a discount I would also recommend going to the sale section and contacting paroxysm.
My mechanic also had similar concerns to the angles and stress put on the stock ones, you can see the angles on the stock links here pointed to in red. It will only be a matter of time before they (bushings) get worn out .. I serriously doubt the actual link itself will snap... you need a very serious force that would cause that ... like driving over a speed bump at over 100 miles per hour .. but then your sway links would then be the least of your worries!
Notice in this picture the new BWoody front links, much thicker than stock and this is taken with me standing underneath the car as its jacked up on a lift (in both pictures)... so the angles shown are the 'extreme'. The truck handles better than stock (coupled with the Bilsteins in all four corners).
I would recommend the Bwoody's links, as mentioned they will survive a nuclear holocaust, you would find a pile of ash in the car park with four sway links in either side of the pile
PS another note, many seem to have had issues with the JKS Discos where the pin breaks off when wheeling if it gets caught in anything ... thats why they are listed as JK fitting only and not WK. Just FYI.