I know each is entitled to his own opinion, and I've never been to Disneyland, but I'm curious as to why you think it's better (aside from it being the first, of course). Care to explain?
And are you sure Walt didn't have anything to do with WDW except selecting its location? I know he died around the onset of construction, but I'm sure he was involved with a lot of the planning. Furthermore, I don't think that the Treasures sets have to be restricted to the Walt-era alone, esp. not where WDW is concerned. It was still his vision and his planning, it simply wasn't completed while he was alive.
I could go land by land and say why Disneyland is better then Magic Kingdom. But that would be going so off topic, so I won't post it here.
No, Walt did not have anything to do with the the Disney World that is there today. According to Dave Smith, at the time of his death Magic Kingdom was not even planned out yet (he didn't even approve the Castle), and he was working on Epcot which was never built. Roy decided to build the Magic Kingdom first since the Company already knew how to do that, and it was Roy who decided to trash Epcot since Walt was dead. Not to belittle Walt Disney World because it's great, but it does leave Disneyland as Walt's stand alone greatest achievement. And that's despite the Propoganda Disney Co. keeps putting out right down to the Disneyland Quote on Florida's Partners Statue and Jimminy saying before SpectroMagic that Walt's favorite time at Magic Kingdom was at night.
These are Walt Disney Treasures, so they have to be restricted to his work. Its right there in the title. And since the current WDW doesn't really look much like what his vision was there is no justification to have one in this series. "EPCOT" should be it.