To the OP:

I’ve done extensively both PAX and Cargo. To answer your question:

Pros of Cargo:
-less flying (less exposure to associated health issues that can shorten your life)
-better mix of schedules
-no pax...
-no FA’s.......
-and in case you don’t understand what that’s like, it means your only job to worry about is moving the airplane. No worries about delays beyond how it affects you. No FAs to deal with (stealing your crew meal, telling you to hold your bladder till they’re done their service, interpersonal issues, “why aren’t you helping us cross seatbelts?!”, etc)

Cons of Cargo (and also pros of PAX)
-lots of night flying (to shorten your life...)
-lack of crews (I know I just said No FAs are a pro...but good crews are also a real pleasure to fly with and can make Those overnights more enjoyable if you are an extrovert like me and have a group to explore the town/food with).
-potential for replacement by robots - hey, gonna happen in Cargo way sooner than pax!

with that said, go with whoever calls you first without a thought. If you have a decision to make later then I’d be thinking about this...