Of the panniers you mention, I've got personal experience with all of them except the Motosport. Here's a few of my observations.
I used the Happy Trail bags/racks on my KLR through Copper Canyon, Baja, and Colorado. The racks are relatively strong and the bags are good size. However, both bags began splitting at the seams. The welds are not strong and the flexing of the bags causes the seams to split. I had the seams rewelded and reinforced - we'll see how long that helps. If they start splitting again I'll reinforce the back of the bags to prevent flexing.
I used the old style Jesse bags on my G/S in South America and Colorado. The racks broke twice from the loads and the pounding of ruta 40. I had the racks rewelded and they've held to this day. The bags are large and sturdy. However, I mounted the new style Jesse racks/bags on my PD and removed them almost immediately. I didn't like the single rail rack - doesn't seem as strong. I also didn't like the flimsy hinges and proprietary mounting hardware, latches, etc. How could I replace/repair these parts in some far away place?!
I had the Touratech racks/bags on my PD until recently. I like that the the bags use a single piece of aluminum attached to the base - seems like less seams to split (see above!). I also like the quick release on the Touratech bags - strong and fast. The racks seems strong, but the mounting hardware is slightly undersized. Also, the bags are on the small size (36 and 45 liters) and are a little "boxy".
I currently mounted the Tesch bags/racks on my PD. These racks are strong and the mounting hardware (which I purchased to match the mounting tabs/holes) is oversized. The boxes are large and easy to get into. There are no hinges and only a simple lock/latch so there's less to break. On the downside, they do not have a quick release system and they are not coated/lined. I'll be giving them a true test soon.
I've found that there is no perfect luggage system. Each has its strengths and weaknesses. Decide what features are important to you (i.e., strength, simplicity, size, quick release, aesthetics, etc.) and go for those. Or get one of each like I did and switch them continually :-)