If you are planning on shooing "seriously" then the choice is pretty important. An avid shooter, of any clay target sport will also usually be a handloader. The cost of new shells every weekend would get prohibitive, and other than the "Grand American" or shoots of national championship nature, nearly all others will allow the use of handloaded ammo. So, the premise of saving money by handloading starts with saving your empties. Easy to do with an Over/Under, or a pump and on singles with a S/A can be done with a shell catcher. However, if you are shooting anything that needs two shots, an O/U is the way to go as a handloader, because nearly all clubs have a rule forbidding picking up empty hulls. With anything other than an O/U at least one of your hulls is going to be on the ground, and lost to you. So, if you can afford one gun go with an O/U, and if you get lucky you can find one with a combo single barrel for singles and handicap.