Is it better to attack or scout Fortresses with level 2 troop specific gear in the armour slot instead of Ubba's scale  as Ubba's scale only has Troop Offense Capturing Fortresses of 80% 

where as Cnut's Vest for Killer has 35% Killer Health, 30% killer Defense and 35% Killer Offense Total stats 105% 

Rollo's Chainmail For Cavalry has Cavalry Health 30%, Cavalry Defense 30% and Cavalry Offense  30% Total stats 90%

Guthrum's Breastplate For Ranged has Ranged Health 35%, Ranged Defense 40% and Ranged Offense 30% Total stats 105%

Reggvid's Hauberk For Siege has Siege Health 30%, Siege Defense 35%, Siege Offense 30% Total stats 95%

Halfdan's Mantle For Melee has Melee Health 30%, Melee Defense 30% and Melee Offense 30% Total stats 90% 

Brodir's Lamellar Armour For Scouting has Scout Health 35%, Scout Defense 35% and Scout Offense 35% total stats 105%

As you can see each set has at least 90% total stats for Health, Defense and Offense combined, where as Ubba's scale only has 80% for attacking Fortresses with no Health or Defense benefits at all when attacking Fortresses.