It is similar to arguing AR vs AK. Comparing competing models, Rugers have a stronger frame but the S&Ws are lighter and have rounded edges. Pre-MIM S&Ws did have a better fit and finish, but not so much with newer models. S&Ws get a lot more support in the way of accessories as there are just more of them. Rugers have a lower retail price but S&Ws tend to do better at holding their resale. S&Ws have a longer history of use with law enforcement and military and are more widely used for competition. One other argument, which has nothing to do with the guns themseves, is from a political POV, that Bill Ruger, Sr. "screwed over" the shooting community re. the AWB but then S&W while owned by a UK interest "sold out" to the Clinton administration. However, Bill Ruger, Sr. is dead and S&W is no longer owned by Tompkins PLC.
PS - you are slightly less likely to poke your eye out while working on a S&W trigger but may need more specialized tools to do so.