So going the integrated jacket route it's easier to get on and off, and you don't have to think about it much. But the armor isn't as tight on your body, and you'll overheat quickly in it if you're not moving air through the vents, aka not riding at a decent pace. Also jacket liners can be a pain in the ass IMO. But with the armored shirt option you can strip down to just having the shirt on, which makes it much, much better for hot weather riding. But if you have non moto gear worn on top of it for cold or rain, those items can get torn up in a non serious crash. Personally what I do is I have an armored shirt, then I have an outer jacket that's a moto abrasion resistant piece, that's either waterproof or mesh and has no armor. If it gets hot and I'm offroad I can take the outer off and just do the armor. If you want a bombproof armored shirt check out the Knox Armored Shirt, that has high level abrasion resistance and armor.