I have several scopes in the magnification range: Burris Signature 6-24X44, 2-Leupold 6-20X40EFR, Zeiss Conquest 6-20X44, Leupold 6-20X50 LRT, Sightron S-II 6-24X42, and 4-Bushnell 4200 6-24X40. They are all really good scopes. The Bushnell and the Burris are VERY close optically with the Burris optics very slightly better. I'm sure it is a good scope but I wouldn't think the Burris 6-20X50 FF-II would quite be in the same class as any of these scopes. Between the two you mentioned, I'd pick the Bushnell Elite 4200 6-24X40. You might add the Sightron to your list. 40 inches of w/e adjustment compared to 30 inches for the FF-II and 26 inches for the 4200. If shooting at longer ranges, that might come in handy.