I think I know where the outcome will be but would like to hear the reasons why. I will begin first.
I have not seen the Malte platinum in person (yet) but from the pictures I like the look of the Vacheron. The case design is a bit more contemporary and I like the round pushers. I do like the classic look of the lugs on the 5070. Its Platinum Vs white gold
The dial is hands down the V&C. I don't like the 5070's sub-dials, they are to big and they crop off the numerals at 2, 4, , &10. The V&C has applied numerals vs printed for the 5070. I do LIKE the hands on the 5070 better. The V&C dial has a nice vintage look while the 5070 is stark.
Movements are basically the same would be interesting to compare the finish.