'Egg et al,
While I am NO FAN of CW, let me say that a watt is NOT a watt when comparing solar panels. There are a lot of variables like mono-crystalline vs. poly-crystalline and the real meat of the subject....output voltages.
If it were simply a matter of price, how do you explain companies like AM Solar, where their custom-made panels sell for as much as double what you listed? The answer is quality, solid company backing, much higher output voltages which yield higher charging amperages at the batteries and systems that WORK as advertised.
There has been a lot of trash coming into the solar market, and unless you are a very educated and discriminating buyer, your purchase will usually result in a sub-par system that will never operate at the true potential of a quality solar charging system.
If you have any serious questions about quality solar, I would direct to Welcome to AM Solar_Your RV Solar Specialists since 1987
for real answers.