This.The Muhle has a superior and heavier chrome coating, but otherwise the quality of Merkur and Muhle razors seems the same to me.
And since the integrity of the underlying Zamac really depends on the coating not coming off, I would think that the Muhle, which has superior chroming, would be likely to last longer. Just picking the odds......
Oh, also the Muhle R89 is 34.99 on amazon at the moment.