Hello Neyya,
I was in the same situation. I was struggling between 1241 and 1454, but I had much more confidence about my work experience that should fall under 1241 rather than 1454 because of my actual duties matching more closely to 1241. My previous employer also agreed with it and I submitted my reference letter with 1241, and now I received the PPR. Go for your belief and just make sure all the responsibilities and duties in your letter are well matched to the one of 1241.
Hey Krystine I'm happy you got PPR. I'm still waiting and last week I got a ghost update, I hope it's a good sign. But yeah just try to match your duties as closely as possible with the duties in the desired NOC, as long as employer agrees it should be fine. I'm still hoping mine is fine lol my job titled referred to 1452 but my duties were more like 1241 so this is what I submitted.