for a TN holder? B or F1?
Generally, you don't have an 'option'. If you are laid off and not enrolled in any school, you MUST either leave US or immediately file for B2 (i-539).
Only if you are either actively enrolled, or about to start in the next week or so, can you go for f1.
The best option of course, is to file for B2 and then find another TN job.
Getting B2 (by filing I-539) is as easy as falling down. (i'm feeling metaphorical today)
Of course, you must then change back to TN to resume working.
Is changing back to TN as easy as falling down once I have a sponsor? Can I change from B2 to TN inside the US?
I like your metaphors.