L5 is considered to be more jam resistant, but it is still in the process of being rolled out and most receivers do not have that capability. It will take the better part of a decade to be rolled out completely but the space side should be done by 2027 so if you need it you can get it but you'll need a completely new receiver.

https://insidegnss.com/onenav-l5-direct-technology-enables-d...

For obvious reasons hard information about all this is tricky to come by, you can read what is available from non-classified sources though and you can glean quite a bit from there.

https://en.wikipedia.org/wiki/GPS_signals#L5

The third edition of 'Kaplan' is still excellent reading on the subject even though it is 10 years old now.