Sorry, but I am new to handguns. I am trying to understand the difference between Square and Round but guns. Can someone tell me if the model 65-5 is square but or round? What about model 625-5? Square or round but? Also, can anyone tell me why smith and wesson made pistols in these two configurations? Is there any advantage or benefit to one type or another? Is there any inherent difference in value between the two? Is one form deemed to be more comfortable or esthetically pleasing? Thank-You!