355 gps

New - in between the 175 & the 375....no transponder but COMM: $7K, probably $6.3K at the dealers. So, can anyone explain the difference between the 335 ($7K) and the 635 ($11K) other than $4K? 635 display: 4.9 in diagonal 335 display: 4.8 in diagonal https://buy.garmin.com/en-US/US/p/689774