If you follow that link, and click on burner data, you can get the manufacturer's description of what makes theirs better. From their description, and what I can see, you're looking at:
- Faster boil time
- Possibly better designed stand (don't know the other model)
From their numbers, it doesn't look like you'd save propane, merely time, so you have to determine how much that is worth to you. Before going electric I had a low cost model, likely similar to what you're talking about (~$75 with a pot). The stand was underwhelming, but not really a problem. The longer boil time was a big consideration for me.
If you have the money, my perspective is that saving time means you brew more often. On the other hand, if saving money means you get the equipment now rather than later, you might brew more now, which is also important.