Both are quality guns and both will do for most anything you are likely to want them to do. The .405 sorta tops out at 300 grains which almost seems light to me but has been used on some pretty big game over the years. The .45-70 can use bullets up to at least 540 grains if you really want penetration.
I'd decide based on which gun feels best to you and appeals to you the most.
GB
I'd decide based on which gun feels best to you and appeals to you the most.
GB