One problem I experience with the windows sticking is from bent window frames. With all of that flex and minimal attachment points of the frame they tend to bend outwards over time. Especially if they are already weakened and you install new weatherstrip. I've even had to break the spot welds and weld it back in straight.
Another issue I've seen is improper channel/weatherstripping size. Don't freakin' ask me why, but my E69 fj55 uses smaller channel than my 77 or doors from a 74 I have laying around. I have not found a channel that fits on my 69 well (besides the more modern door).
And for what it is worth, you will not see a quality difference between SOR and JC Whitney. The only real difference is about $23 per door. (I actually like SOR though, just not all their products prices) Also, you should probably clean the part the window attaches to and adhere the rubber into place, as each time less and less force is needed to yank the window off the regulator.