I clip wings. It makes it easier to use all sizes of cages, and also helps to retrieve the occasional escapee.
Wing clipping has to be repeated at least twice a year after molting. I normally clip wings in late fall when days are shorter than 12 hours, and again in Spring when days lengthen to more than 12 hours. I keep my quail outside without artificial lights, so they go through seasonal molts.
Always allow them to completely finish molting before clipping to be sure not to cut any blood feathers.
You may need to clip more than twice if illness, malnutrition, or parasites such as mites cause your birds to molt out of seasons. I also wait until birds are 8 to 10 weeks old to be sure they are completely in their adult feathers.