Definitely this, especially if OP has non-9-5 hours. There’s loads of EWR workers doing what they’re doing, from ramp workers and FA s to A/P and pilots.

62 runs 24/7 (downtown Newark and Elizabeth)

37 runs 4am-11:30pm (Weequahic area in particular)

go28 runs basically 24/7 (along Bloomfield Ave in Bloomfield and Newark)

Ignore 67, very limited schedule.

Train (NEC or NJCL) to Airtrain is decent, but check the schedules carefully. 107 provides overnight bus service from NYC.