u/Fit-Account5620

I have 6 metal raised beds to fill. They are 36x72x22. I will likely fill three this year and three next year. I am seeing mixed advice. A lot of advice says triple mix and others said premium garden soil. There seems to be a range on costs. What do I ask to make sure I get the best option for the best price. It would be bulk delivered and they are veggie gardens.