when shld u use spinlock vs the mutex version?

i already read this but i prefer having your feedback in regards to usage with gopool:

https://mmomtchev.medium.com/spinlock-vs-mutex-performance-3f73de53a460


can you also list out the limitations / caveats compared with ants, 
https://github.com/bytedance/gopkg/tree/develop/util/gopool

https://github.com/alphadose/itogami
just curious what ur thoughts on these are. thx