For meat purposes I would think coturnix/Japanese quail or bobwhites would be a better choice, this will depend a bit on the space you have available and how many you hope to be dealing with at once. The coturnix need a minimum of a mere 1 square foot per bird once out of the brooder and I've heard bobwhite need about 3 square feet per bird, but I haven't kept or researched them as much so someone else could tell you more accurately on the bobwhites.
Another thing to keep in mind for breeding is that you will need an incubator, I know coturnix with not go broody and hatch their own eggs and I believe the same is true of domestic bobwhite? I have not seen anyone mention hatching their bobwhite other than in an incubator but I could be off on that one. Again, not my species.
Also the market you would be trying to sell to would affect which bird would sell better. Coturnix are often chosen for eggs and pets as well as meat, where as the bobwhites are less for either of those (bigger bird but smaller eggs and less tame from all I've read) but are a larger meat bird and often popular for stocking hunting land and training hunting dogs. Which would be more desirable in your area would be a good starting place if your main goal is selling them.
Naturally the type that appeals to you most to keep is an important factor too! I would look at the appearance and behavior of each type and see which you think you would enjoy keeping as well. I listened to the 'crow' of coturnix on youtube videos before we got ours to see how loud it was and if the sound would drive me crazy. So far I find it very soothing, but our boys are still young and just starting to crow.
Are the existing pens you have fairly enclosed or more open wire cages? If they're enclosed a lamp may be perfectly fine for the winter. Another thought, if the pens were used for other birds before be sure to thoroughly sanitize them before you put quail in them. Quail don't have immunity to things certain other birds carry without showing signs, especially chickens.
Good luck,again I hope my research so far is of some help, quail are a lot of fun to learn about and start up with!
Jessie