Roy Smith writes:

[...]
1) The larger screen on the 480 compared to the 430 is a real advantage.
Of course, the 530 trumps the 480 in that respect, and the MX-20 trumps
them all!
[...]

Plus there are other GPS/MFD options out there too. I have a 430
driving an Avidyne EX500. With the big versatile MFD showing
weather/traffic/etc., there is rarely a need for the 430 to be in map
mode, so its compact size is an asset.

- FChE