Official FIDE World Championship set is back in stock at ChessBaron, $369usd. It's been out of stock for months. I would certainly grab that set right NOW before the World Championships in November. Do not purchase the set bundled with the 50mm (2") board. The bundled board has nothing to do with the Championships. You can do much better buying a separate 55mm (2.25") board.
Be a bit careful with comparing board sizes though.
Current US (?) standard sizes seem to be 2" (50.8 mm) and 2-1/4" (57.2 mm). Only on Frank Camaratta's website did I read about 2-1/8" (54.0 mm), which seems to be a historically relevant standard for the type of Jaques reproductions he sells.
Europe (or non-US?) standards are 50 mm and 55 mm.
As you can see, neither 2-1.4" nor 2-1/8" equal 55 mm, but but 2-1/8" is a lot closer. The 2.2 mm might not seem very significant, so I provide visual proof:


To my eye, the set looks significantly more crowded on the 55 mm board than on the 2-1/4" board.
And in fact, I recently ordered a 2-1/4" JLP board at Chesshouse, thinking it was the closest analog to 55 mm. The board is beautiful, but I just can't get used to the "airyness" of pieces on a 2-1/4" board. To me, the pieces look a bit incoherent, a significant tad too loose. So, with some pain in my heart, I might actually return the board, and start a search for a nice 2-1/8" or 55 mm solid wooden board, which unfortunately do not seem to be in great supply.
The OP, @complimentaryjet, was very specific in that he likes Set A and Set B. He asked, "Any advantages or disadvantages besides style that I may not be taking into consideration?" Didn't need to trash either of his choices.
But hey, if he's cool with it, it's all good.