I'd hands-down trust the k7000. I've rebuilt and repaired so many monitors and those things are tanks. The colors look great, and they don't get too hot. I'd recommend getting a cap kit done though.
And depending on the tube you put it in, you may have to swap out the width coil capacitor. It's a big polypropylene cap right by the white inductor. Get the width right, and you'll have yourself a chassis that will run for damn-near forever, and look great too.
The wg7203 is decent, but it's not as robust as the k7000. it's a lot easier to plug everything in, since the terminals are all along the outside of the board by the flyback. Other than that, they just felt a lot cheaper to me. Plus, I don't believe there's a reliable source of replacement flybacks for those. I could be remembering incorrectly though. Been awhile since I had one.