The 7/2 has more soft attack (because of the artillery) but the 10 infantry battalions have more defence, making the 10 infantry battalions good for defence of lines and the 7/2 good for offensives, these are cost effective divisions that are good for minors and majors. You can use 10 infantry battalions (picture above) or 7 infantry battalions and 2 artillery, known as a 7/2. If you are not new, or you watch any HOI youtubers you will hear this a lot, the 20 width infantry division is a great defensive and offensive division which can hold lines while a stronger divisions breakthrough – a cost effective division for minors and majors all to use. Keep in mind these can be used in multiplayer, they just might not be as effective