what is the best small block and why ?

hy guys i bought a 76 dodge dart about a month ago and it corrently has a 318. what is the best small block 340 or 360 and why is it better. i see alot of people running 340 but to me i would think a 360 would be better to build because of bigger cid but i just dont know so if some one could educate me that would be great.