Excuse my ignorance but what is P1?
It's a (British?) term for PIC or command time.
It depends where you want to go with your career.
I'm only a sample of one but I've never flown an Airbus or Boeing with a former mustering pilot. That probably leads into the ag flying end of the industry.
I've flown with many whose path has taken them through the parachute industry. Probably safer and more sociable too.
Like the Qf vs VA vs JQ question, most just take the first they're offered.