In other words, Which cases have the highest opportunity for me to get an expensive skin or knife? Is it the operation cases? Weapon cases or the Tournament Cases?
In almost every case you will have the same amount of money from all the items, pretty much nothing. It really depends on what the worth is on the market (ex. Huntsman is worth $100 so you open a huntsman case). Each case has different items and their worth on the market dictates if it is worth it to open the case or not.