Category 1 is more expensive because the view is significantly better and position is closer to the grounds, try getting them or even cat2 is poss. I went for cat3 once and didnt have the full experience I was hoping for, was left sumwhat disappointed and decided not to get them again. i guess if you are a regular it dont matter as you can hear anyway but I only go rarely as a special occassion. Def sticking to cat1.
Would appreciate any tips too! Though trying to navigate a man crush of 100k ppl wld be a challenge in itself a signed jersey from messi is a dream souvenir for generations to follow!