You can increase cycles per year by having separate veg and flower rooms. If that is your main goal, setting up separate rooms would be in your interest.
Some people also like having different rooms so they can veg under T5’s, LED’s, MH’s or other lights with more of a blue spectrum. Then, once plants are ready for flower, move them into a room that has HPS’s, or whatever your preferred light for flower is.
However, my preference is having one room for both veg and flowering. Plants are stationary beings. They don’t want to be moved from this room to that room and manhandled as they’re being pushed around on tables. Changing between rooms is changing the atmosphere that they have gotten used to, therefore, stressing them out unnecessarily. I believe that happy plants will ultimately bring you higher yields and higher quality. Although, the right kind of stress on plants never hurts.
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