I’m guessing you are Conor from MTBrider?
If you are getting new shoes you might as well get your gait analysed, Up&Running in Belfast are good. Podium in Castlereagh have a few good deals on but don’t do analysis. As for brands, they are all slightly different shapes. I went though New Balance, Adidas, Nike, thinking that blisters were just part of braking in shoes. Now I always buy Asics and I’ve never had a blister from them. Find the right brand for your fett and stick to it!
I would be wary of out and out trail shoes, the lack of cushioning means you should only really use them off road.