The marlin is much easier to slick up. The miroku will look better. More sight options for the marlin if your eyes struggle. My marlin prefers 357s to 38s. My Rossi 92 I could tweak to run 38s, or tweak to run 357s, but never wanted to run both. The Browning 92(miroku) seems to run them fine.
I like my action jobbed marlin I restocked with a slim forend better than my standard Browning/miroku 92. Now, if I ever get around to slicking up the browning it would be closer, but I still think I'd prefer my modified marlin.