I have tried both. Personally, I like the Costa's just a little better for fit and the the lenses. I use the Costa Harpon model with the Blue Mirror glass 580 lenses. Whether fresh water or salt, I feel like I'm getting good protection and supposedly 100% UV blockage and 100% polarization. I have been wearing the same lenses since 2002, but the frame styles change from time to time.
Capt. Craig Copeland
Licensed by the US Coast Guard
2013 Nautic Star 2110 Shallow Bay Boat
Humminbird HELIX 12 CHIRP MEGA SI GPS G2N
Nautic Star Boats Pro Staff (nauticstarboats.com)
Redneck Fish'n Jigs Pro Staff (redneckfishn.com)