I used my Mountaineer's for the first time at league last night. One of my main goals in finding new binos for indoor target was light gathering ability while still being rather compact. These are the brightest I've seen, and still keep damn close to the clarity and sharpness of image that the Venturer's have.

At some indoor ranges, the lighting may not be the best and it can be hard to get a good image, that's why light gathering ability was a factor for me. Well after last night, I'm VERY happy with my new glasses- brightest target face I've seen yet for a pair of binos this small. And I was never able to read the fine print on a NFAA 5 spot before....

The Venturers may have a slightly better depth of field, and they do have a larger field of view. As I said, they are awesome compacts- the best I've seen. Depends on what you want them for. I think in daylight the Venturer's provide a slightly sharper image, while in low light the Mountaineer's gather more light.