Overwintering Onion Sets

A quick simple rule is that the sets for sale now are for over winter growing to be ready in May / June... and the ones for sale in Feb / March are the Spring planting ones for summer crop.. these are the ones to grow for storing. 

There are so many summer types...   I grow stuttgarter giant, setton, sturon, turbo.

I've had good crops from Stuttgarter and Sturon and they both store well.
Not so good with red onions oddly?
Hoping my winter Senshyu do well - no sign of green sprouts yet.