[Is getting 40 GB of Disk Space on a custom plan worth it?]

I'm trying to decide between getting a custom plan and what I should choose specifically. The two options I've come up with are:

- 4 GB of RAM -&- 40 GB of Disc Space

OR

- 6 GB of RAM

 

Is disc space even worth it, or would getting 6 gb of ram be better for my server's performance?

[Update FAWE Worldedit]

FAWE worldedit isn't updated to 1.17 or atleast it isn't working on 1.17. Using normal worldedit crashes the server often. Please update FAWE worldedit to 1.17. (Using FAWE makes it so the server can't start, and even if it did start I'm guessing it still wouldn't work.)