i don't own either, but the rugers and brownings both seem quite nice.
however, i did read recently (since i myself am in the market for a 22) that someone tested the loaded chamber indicator on their ruger mk III and found that it was unsafe. i guess the chamber indicator fastens itself around the rim of the cartridge..., which it's obviously a rimfire cartrige, and that if struck hard enough it'd cause the cartidge to fire. since/if you have children that may be a particular concearn. however, i've read other tests on this feature that have yeilded safe results, so it may well just be a myth created by a disgruntled ruger customer.