Depends how small.
Any studio head will take a LOT more space than a speed light. In general it will also be better - unless the size stops you using it effectively.
Richard - sorry not following you at all. A4 with speed lights? Or studio flash?
Both - depends what (how big) the item is you are shooting and where. I essentially, on the fly. use bits of well positioned card, fabric, translucent paper, reflective card to block light, or act as a light source, or to partially modify a light source
But, FWIW, in my head, above, I was referring to studio flashes