How to choose the best:
Eggplant

AKA: AUBERGINE

Touch

Avoid any soft spots, and look for a sturdy, rough stem atop the eggplant.

See

Whether light purple, deep purple, white, or some mixture thereof, look for a very glossy, shiny skin, without many blemishes.

Some more details:

When it's in season

Jan. Feb. Mar. Apr. May Jun. Jul. Aug. Sep. Oct. Nov. Dec.