Kilt Pin or Brooch?

[PiobBear]

kilt pin...brooch...which one do you prefer and why?

I wear a plaid brooch with a plaid, a penannular brooch with a brat, and only occasionally will I wear a kilt pin; at best they cause unnecessary wear to my apron; at worst, they snag on something and tear a hole.

...the difference in a kilt pin and a brooch?

At least to my understanding, it's not either/or; a brooch and a kilt pin are two entirely different things.
A brooch is often a big (2 1/2-3") round pin, often with a big stone or emblem in the middle, used to secure a plaid to your shoulder. For the Irish, it's traditionally a penannular "Tara" type brooch, often larger than a Scottish plaid brooch. A kilt pin is a little decorative thing secured to your outer kilt apron, which actually serves no discernable useful purpose.