I think the accuracy of the 45-70 is being underrated. No, a Marlin 1895 isn't a good candidate for a tack driver, but shooting off hand I can keep mine confined to fist sized groups at 100 yards. I use aperture sights.
The lighter 325 grain 45-70 loads (Leverlution, which are also the cheapest) kick about the same as heavy 305 grain .44 magnum rounds out of my much lighter Rossi M92. Which is quite a bit less than even a .308.
I haven't tried these Garrett Hammerhead 540 gr, which I think would probably kick in a very unpleasant way. I have run plenty of 430 grain gas checks through it. Recoil isn't awful with those, but I fired once with the stock poorly seated and it left a hell of a bruise. The LOP on the stock 1895 is way to short for me. If you're tall that may be something to consider.
I know a lot of people who use the .375 H&H, but I do not like that round. It is very accurate, and a great large game round, but the ones I've fired have all had very unpleasant, jarring recoil. Not much in the way of pushing, shoving, or slapping, just an unpleasant sort of concussive shockwave that travels across the cheekweld and gives me a headache.
Of the two the H&H is the superior round in all respects other than the 45-70 leaves a bigger hole, but I'll take the 45-70 any day of the week.