It depends on how many eggs you want. some bantams lay only a few small eggs, some lay more and a bit bigger. I have had bantams, and although cute, did not earn their keep. i now have large fowl, pure breed and hybrids. I get a whole spectrum of eggs, large, medium small, white, pinky beige, blue, green and brown. the hybrids are the best layers, and very freindly. the pure breeds are more interesting and add variety. They are easy to keep, just look after their welfare. clean water, good feed, some where to scratch about, safe from the elements and predators and a comfortable size coop with nice private laying boxes. It's great fun and very addictive keeping chickens. you also get fresh eggs for breakfast.
good luck