MVP award itself is arbitrary and relative to human perception as opposed to mathematical value. Voting in both respects is skewed towards home runs, because home runs are sexy, and nothing else matters to people
They're both MVPs, just as they're both HOFers... in their own way. But yes, Player B will hit the most home runs, that is a certainty based on vR + power. But A contributes value in a different way overall from a scarcity perspective