Well two things:
1. I am mostly blademaster in my game so using the True Devil Slicer is better on the 2 Tigrex Urgent mission.
2. For gunner armor for other quests, I just found out an hour ago that I have Hunter's U gunner armor. I don't know when I made Hunter's U gunner armor that's odd to me LOL. I was going through the Create Armor list from the blacksmith and was browsing to see if I was gonna make some Velociprey/Giaprey/Ioprey S or U blademaster armor to free up some space in my equipment/item chest. I was surprised to see that I have Hunter's U gunner armor. Dunno when the hell I made Hunter's U gunner armor. Oh well. At least I have some other gunner armor besides Ceanatar S gunner armor.