is the 20$ 3x pack worth it?

hi! im still debating whether or not i wanna buy it because im def going to keep buying the monthly pass and that gives 300 stellarite and 2700 diamonds,,, which i love! bc im a gacha fiend, but the 20$ one is 3.8k!!! so i can buy the store outfits!! and whatever in the future! but i can also keep buying the monthly and saving the stellarite from that ?

so im like so back and forth on it. helllpppme pleasee