FL Sunday or Monday (memorial day!)??

Going to Cedar Point for the first time in several years in a couple weeks and staying on the property for the first time ever.
Very interested in getting FastLane but know we can't budget it for 2 days. We will be getting the 2 day ride and slide ticket for Sunday, May 27 and Monday, May 28 (memorial day).
Which day would you recommend getting FL for?

I would recommend getting it Sunday. My family has gone to the park the past two memorial days and it's not very busy at all. I'm not sure how the Sunday before memorial day is though but I know Monday isn't very busy.

Go Monday. Out of Saturday, Sunday, and Monday, Sunday is always the most crowded. At least it has been this way for the past 5 years.

Thanks, will buy it Sunday and get as many rides in as possible as many times as possible, and relax more on Monday.
I appreciate the advice.
If there is anyone going Sunday May 27 and wanting to team up to buy the group rate FastLane Passes, let me know!