|Applehead Siamese cat - photo by emdot|
Applehead Siamese cats are traditional Siamese cats. I am not sure who made up the rather demeaning phrase "Applehead Siamese". It was probably the Siamese cat committee at the Cat Fanciers' Association (CFA) who coined the phrase as the CFA support and promote the modern Siamese cat. They don't even recognise the traditional Siamese cat - ridiculous as the Applehead is the original Siamese cat shape and body conformation.
I have pages on the various types of Siamese cats on the main website, which explains the differences in detail: