14, 15 ga wire -
the machined hole in the solder cup to make soldering
and checking easy.
16, 18 ga wire -
the solder cup gets trimmed (instructions below) for even smaller size and less weight and an easy-to-make "butt joint".
20, 22 ga wire -
solder cup fully removed for even less weight / smaller size.
Planes that draw more than 20A will be large enough for
Sermos / Anderson Power Poles but
JiffyPins are the best connectors available for high-current Sp400 - Sp480 motors (10-15A) where the fuselages are too small to fit Sermos / PowerPole connectors.
Since they can be used with 14, 16, 18, 20, 22 AWG (basically
all electric park flyers / slow flyers) you can set up all your smaller planes with the same, easy, sweet, interchangeable connector.
(I recommend leaving the connectors on ground-based
equipment (chargers, meters, etc) with Sermos connectors and
making one of the Sermos / APP adaptors to convert them for use
with Jiffypins - see instructions below).