Also, here are their playoff point finishes on their team.
Alfredsson
1996-97
1st in goals, 3 more than 2nd place.
1st in points, 1 more than 2nd place
1997-98
1st in goals, 2 more than 2nd
1st in points, 1 more than 2nd
1998-99
2nd in goals, 1 less than 1st
2nd in points, 1 less than 1st.
1999-00
2nd in goals, 1 less than 1st
1st in points, one more than 2nd
2000-00
1st in goals, only goal scored.
2nd in points, 1 less than 1st.
2001-02
1st in goals, 3 more than 2nd
1st in points, 3 more than 2nd
2002-03
5th in goals, 2 less than 2nd
6th in points, 8 less than 1st
2003-04
2nd in points, 1 less than 3rd
2nd in goals, 2 less than 1st
2005-06
5th in goals, 5 less than 1st
4th in points, 4 less than 1st
2006-07
1st in points, tied with 2 other players
1st in goals, 7 more than 2nd
2007-08
13th in points and goals
2009-10
4th in goals, 1 less than 1st
2nd in points, tied with 1st and 1 less point than 3rd
2011-12
6th in points, 3 less than 1st
2nd in goals, 1 less than 3rd
2012-13
1st in points, 1 more than 2nd
2nd in goals, 2 less than 2nd
Zetterberg
2002-03
7th in points, 2 less than 1st
tied with many others for 1st in goals.
2003-04
6th in goals, 2 less than 1st
8th in points, 4 less than 1st
2005-06
1st in goals, 3 more than 2nd
2nd in points, 2 less than 1st
2006-07
2nd in goals, 2 less than 1st
3rd in points, 4 less than 1st
2007-08
1st in goals, 3 more than 2nd
1st in points, 4 more than 2nd
2008-09
2nd in goals, 1 less than 1st
1st in points, 1 more than 2nd
2009-10
1st in goals, 1 more than 2nd
2nd in points, 3 less than 1st
2010-11
2nd in goals, 1 less than 1st
3rd in points, 7 less than 1st
2011-12
1st in points and goals, 1 less than 2nd place
2012-13
2nd in goals, 1 less than 1st
1st in points, 2 more points than 2nd
2013-14
2st in goals, 2 less than 1st
2nd in points (tied with many), 3 less than 1st
2014-15
8th in points, 2 less than 1st
no goals, 3 less than 1st
2015-16
1st in goals, tied with many players, 1 more than everyone else
3rnd in points, tied with many others, 2 less points than 1st
I know Zetterberg has statistically higher PPG and GPGs in the playoffs, but compared to his peers, Alfredsson led his team in points 6 times to Zetterbergs 4. Both led their team in goals 5 times. So it's debatable whether Zetterberg has the edge in terms of overall playoff career.