Super important question here , but... Which do you like for our stalls and are they close enough that you would buy whichever one is cheaper? They are both 12" long so they're pretty darn similar in my opinion, but... I do like one a tad better (I think just because they were the first ones I found) but was surprised at the price difference.
I can't tell much about them from the pictures. If either has a Delrin bushing to prevent metal to metal contact in the barrels, get that one.
Make sure to align the barrels when fastening them. I fasten hinges to the door first using a long level to align the barrels. Then wedge the door in place and install the rest of the screws. Any misalignment will cause premature wear on the hinges and cause the doors not to swing freely.