I'm coming out of a Z521C and trying to decide between a 20 or 21. Anyone have a 20 and wish they would have went with the 21 or vice versa? Looks like the speeds are about the same between the 2 if I go with a 300 on the 21 and from what I can tell I'm either losing 5" of front deck going to the 20 or gaining 5" of deck with the 21 (based off measurements compared to my 521C). I like the extra box in front of the driver side console but wouldn't be a deal breaker to not have it. Any thoughts are welcome. TIA