I was wondering the following. Suppose we have two mathematicians, up for consideration for a tenure-track position. Which would you hire?
Mathematician A has written several papers, but only 1 or 2 are single-authored, and the rest are written jointly with other mathematicians.
Mathematician B has written less papers than A, but most of his papers were written by himself.
Assuming that their papers were of similar quality, what does the mathematical community prefer?
Perhaps this has already been asked, but I can't seem to search for it.

