step up packs vs mega prem packs

i plan on getting one, but not sure which to go with, my budget is 50-70$, which should i go with?

Step ups give better odds of higher rarity cards, but you have to go all the way up to Step 7 to really benefit. If you are going for the abyss keys for the current event, then mega packs are more worth it up to $80 as you get more keys.

yup the main reason are for the keys, i'll go with the mega packs then, tyvm