Not long ago, I read that Ruger determined that the castings they produced were stronger than bar stock, which is what many other actions, including M70s, I believe, are made from. As long as the castings are well finished, not an issue for me.
The trigger would be an issue, as well as the method of attachment on the M70 bolt handle, which has been known to fail.
The most important factor is which one you like the best.
