If you get surplussed, you ARE essentially retiring if you have met MR75. You're just being forced into it.
As others have mentioned, it's really just a personal choice.
The company is banking on many in their 50's (like me) leaving voluntarily this year to maintain their pre-65 healthcare insurance subsidy (not all are eligible for that, depends on legacy company and hire date, check your YTR). If you are in this group, you can bet you will not be laid off in 2021. They aren't going to put themselves on the hook for the subsidy and a severance by laying you off. That said, you may move to the prime target list on Jan 1 2022.