Wide Angle Lens: 65 vs 80 degrees

Can someone give me an idea of what the differences are between a 65-degree and an 80-degree wide angle lens? I'm contemplating the purchase of a Gates housing and was comparing the WP25 (80 degree) and the GP25A (65 degree). I like the idea of a field replaceable lens, but also like the idea of the 80 degree.

What would be the advantages of each lens, and if you had to only chose one of these which would you choose and why?

BTW - most of my shots will be wide angle shots, although I do plan on some macro, I will be using a flat port for that since Gates doesn't have a wide angle lens which offers full zoom (except the SWP25 super wide, which is not an option for me).

Thanks,

Paul

If you shoot mostly wide, the choice should certainly be the 80. The FOV on an 80 lens makes it a great all purpose lens. I shoot mostly with and 80 and find it to produce excellent results.

shawn