What is the difference between the Ultra and Snackmaker?

• The Snackmaker is 34cm in diameter and can expand to 15 trays. It has 3 temperature settings – 30,50 and 63.
• The Ultra is 39cm in diameter and can expand to 30 trays. It has variable temperature settings from 30 to 63.
• Both come with 5 trays and 1 mesh sheet and 1 solid sheet.
• The Snackmaker is 500 watts and the Ultra is 1000 watts