I thought it was a strange choice, not because I think anyone ordering from that site has an opinion on the merits of different types of cuneiform, but because I think the Old Persian glyphs are much simpler and will therefore appear less ornamental than e.g. Akkadian would.
Those who do have an opinion of the merits of different types of cuneiform are ordering custom items from Jeremiah Peterson.
The choice of Old Persian cuneiform is lazy, much like those Egyptian cartouche name necklaces that use a hieroglyphic alphabet rather than even attempting to write out a name as ancient Egyptians would.
