Maybe I should have said more versatile. By the time Billy was here, he had lost the range to play SS on a regular basis. Marwin you feel comfortable playing, 3B, SS, 2B, 1B, LF. Billy was solid at 3rd and OF. Marwin is also a switch hitter.
Their numbers, at the same point in their career,s are pretty similar, though Marwin has hit for more power.
Another Marwin comp might be Ben Zobrist.