Anyway, armor inflation aside, remember that bit about Hinata and Fury? Well, we actually have a chart list for the most used Combat Manuals.
Basically,
1st - Hinata - Fury
2nd - Marth - Pivot and Spur Speed
3rd - Roy - Triangle Adept
4th - Lon'qu - Vantage, Glimmer and Killer Edge
5th - Athena - Wo Dao and Moonbow
6th - Ogma - Brave Sword and Noontime
7th - Cain - Wings of Mercy
8th - Chrom - Sol and Aether - *in the distance, you can hear
Opossum
screaming*
9th - Jagen - Fortify Cavalry
10th - Barst - Reposition and Spur ATK
11th - Selena - Reposition and Threaten SPD
12th - Shanna - Desperation and Iceberg
13th - Laslow - Noontime and Axebreaker
14th - Gunter - Hone Cavalry
15th - Fir - Glacies and SPD+3
16th - Hana - Life & Death
17th - Palla - Moonbow & Goad Fliers
18th - Henry - Ignis and Green Tomebreaker
19th - Draug - Ward Armor
20th - Subaki - Quick Riposte