Which one do you prefer?
For this particular voice I like the pronounced low-mids of U87, but I would probably EQ them out in the mix anyway - so I guess UM70 sounds like the "processed" vocal I would put in the mix...
But for spoken word, minimalist arranged ballads I would like one U87 around I guess.
What's that - more proximity effect on U87 or what?
I own UM70, so I'm a little biased.