BFR or S&W
I own a 460 S&W PC 12" and now am purchasing a 500 mag but in the BFR. Although I like my Smith I just don't think they have it when it comes to HUGE POWERFUL rounds. The BFR is built like a tank.
Yes the Smith is DA but there is NO way you can get a double tap with that unless the second round is going to shoot geese at 40,000 ft up. The "star" extraction is "sometimes" quicker. Not if you have fired hot loads, or have previously fired 454 or 45 colt in it then fired the 460 rounds. They will stick to the point that you might have to pound them out with a dowel. Don't fire the shorter ones first!
Single action is easier to extract. In heavier loads I have gotten cylinder jump as well with the Smith. This is where it actually becomes unlocked and will pass the next round. So when you cock it again you will "skip" a round. I had read about this on the 500 but it shocked me to see it on the 460.
The BFR has a massive frame that I have seen take a full load of 500 mag and contain the cylinder with an obstructed barrel. The barrel blew out but the cylinder and top strap held that was insane!
Reloads are going to be a bit slower with the BFR, but IMHO looks better anyhow. The longer Cylinder of the BFR will allow you to play with the seating depths of large grain bullets allowing them to be seated out further, reducing pressure. In addition, some others like the 45/70 you can order a 450 marlin cylinder and shoot both!
I have had my frame replaced on the S&W I would not buy another S&W in 460 mag, I might consider one in 500 but the 460 the pressures are just way to high for the x frame. I feel that the BFR would be a much better choice for this round.
I will be picking up my 500 tomorrow in a 10". Not only do I like them better, but they are cheaper! I'm getting mine for $699. Much better than the $1100 I spent on my S&W.
I like the BFR's because they remind me so much of the Ruger's that I own and they too are renowned as being built extremely tough.
I'd love Ruger to come out with the 500 or the 460 but that is unlikely...