SAP is not a good reason to pick PSA IMHO.

Back in the day guys figured out how to work the system to have up to 15 days off while crediting 100+ (I've even heard stories of people crediting 150ish). That is a near impossibility these days(for 98% of the pilot group SAPing)

SAP is useful if you know a month in advance what days off you want and you want to babysit a computer for 24 hrs trying to make trades (not a necessity but... YMMV) as it takes hours upon hours for trades to process (it used to only take a while during the first couple of hours of trading)