The only one I'd keep sight unseen would be the Browning. With the rest of them, it'd come down to the individual rifle more than anything. Maybe there's one you've never shot well, one that doesn't always feed cleanly, one that has a "hitch" in the lever, etc... I'd keep what works for you and sell what doesn't. If all six of them work flawlessly, I congratulate you on your rifle-buying fortune.
Yup, that's it. The Browning will, all things being equal, be the superior firearm. For the others, save the one you have the strongest personal attachment to, or shoots the best. It will be kind of a long day testing them all, using different ammos, but fun!