Frank,
I have flown with both the SN-10 and the 302/PDA combination using
Winpilot in sports class competition. I can't back up my claim with
data, but my impression is that the SN-10 does a better job with wind
and final glide calculations. I believe the PDA with Winpilot has a
far superior moving map, and is a bit easier to enter tasks, but if I
had to choose I'd still go with the SN-10 over the 302/PDA combination.
Happily, I actually now use both. I was able to build a cable and
toggle switch which allows the GPS engine in my 302 feed both my SN-10
and the PDA, plus I have the option of downloading flights either to
the PDA or from the SN-10 to a laptop. I typically use the SN-10 as my
primary navigation and flight data computer and keep the PDA as a
backup. I only turn it on every now and then when I need to see the
moving map.
I'd keep the SN-10.
Clay