In case it helps:
Left to right: Rectus 19, 21/EZ Snap, 26:

We haven't got the 19s or 26s in stock yet.
The genuine Rectus 21s or EZ Snap can last well if they are kept from dragging on the ground and being wet
all the time (i.e. in pools of water) by using a protector ball either side of the connection. The WD40 dazmond uses might be helping to prevent corrosion by dispersing the water too? Haven't tried that.
It's recommended that you replace male and female at the same time so that you can be sure of a good fit and that an old one of either connector doesn't damage the new.
Paul