First, what happens if a card isnt on the Reserved List, but is still a land with a powerful effect
The other, on the other hand, is just a gun
But if you control a Judith and cast another, the second one dying triggers two pings
I almost always prefer the former method because if ink gets pulled when you take the tape off, its far easier to patch up a black border than color-match and patch the back of the card and if your sleeves arent opaque on the back, a noticeable paint job will disqualify a card in tournaments (and it is noticeable)
The price memory of Jaces heyday is probably propping it up a little, but itll keep some value for a while yet
Its often played as a control commander because it represents both win condition and card advantage