They are both better, far more robust.
I have been running the AB Kestrel alongside Coldbore using a Windows Phone. (CB syncs to a desktop, PDA, and Phone ) and while the Elevation for both are very good, I find the wind calls not matching up as well with the AB Kestrel. Something in its wind calculations are lacking. Both CB & FFS have been used by many ( including me) to distances beyond 2000m with stellar results.
In my opinion, Pesja based solutions beat Point Mass every time.