. Well, I grow both, onions & shallots.
I've grown shallots for about 20 years. They keep super, super well - and what you have in the spring, you can plant. I don't put them in the ground in the fall.
Shallots have a different flavor from onions. They are kind of special as a scallion but also kind of a little too valuable for that
. It seems best to me to allow them to bulb up. Taste is subjective and some like this, others like something different.
What I didn't grow in this family in 2011 was leeks and now I'm sorry about that. What I haven't grown in 15 years or so, is garlic. I'm okay with that. We do use garlic but only a clove or 2 each week. Shallots keeps just as well or better than garlic and, altho' I don't use as much as the bulb onions, it is still nice to have a fair amount.
edited to add: I keep the basket of shallots in the garage. it is really cold out there thru much of the winter. there's no question that it freezes. this is always where I've kept the shallots and I don't really know how they'd do in, say, the kitchen thru the winter. that's where the garlic that we buy stays and it will sprout after awhile. probably a little to warm for them there.