Joined: Aug 2010
Posts: 12,728
Likes: 2,105
From: Madison, WI
Bikes: 1961 Ideor, 1966 Perfekt 3 Speed AB Hub, 1994 Bridgestone MB-6, 2006 Airnimal Joey, 2009 Thorn Sherpa, 2013 Thorn Nomad MkII, 2015 VO Pass Hunter, 2017 Lynskey Backroad, 2017 Raleigh Gran Prix, 1980s Bianchi Mixte on a trainer. Others are now gone.
You are comparing 4 and 5 arm cranks with different bolt circle diameters. If you might want a lower granny gear some day, think about how low you might want to go. Some cranks will only allow a 24t (or bigger), but some other cranks will allow chainrings smaller than 24t.