I'm partial to peaks that are comprised of full/almost full seasons and playoffs (if they are to be included).
Accordingly, the only real candidates for me are Ovechkin from 2007-2010 (2008 being his best season if I had to choose one and 2009 being his best RS + playoffs combo if I had to choose one), Malkin in 2008-2009, Malkin in 2011-2012, Sakic in 2000-2001 and maybe Crosby in 2013-2014 and/or Kane in 2015-2016.
HMs would be Crosby in 2006-2007 and 2009-2010, Thornton in 2005-2006, Stamkos in 2011-2012, McDavid from 2016-2018, St. Louis in 2003-2004, Henrik Sedin in 2009-2010, Karlsson in 2011-2012, possibly Jagr in 2000-2001 and/or 2005/2006 and maybe Forsberg and/or Naslund in 2002-2003.