Sounds like it depends what country you're in. I find AliExpress Standard delivery to be really good, to UK at least, so I wouldn't pay extra for another option. Fully tracked door to door with a text message on the day of delivery from Royal Mail, and generally takes around 3 weeks from placing order (record being just over a week!) Longest wait has been around 5 weeks, when things seemed to be held up in London for a long while, just after New Year.
China Post airmail is probably about the same, but there's more suspense involved once it leaves China, as no tracking beyond that.
Have used E-Packet once, and it didn't seem significantly different