The newer ones are a better choice for shooting, as opposed to collector pieces, since they have reinforced internals for improved durability compared to older models (29-3 and earlier). Yes, the zit in the frame for the internal lock is unsightly and the MIM parts look a little chintzy, but they are generally perfectly serviceable. Future parts availability might be a concern, as S&W started the transition to MIM parts 20 years ago.
As to nicer, it depends. The real "good old days" for S&W would be prior to being sold to Bangor Punta in 1965. Model 29s from this era are without question unparalleled in quality of finish. S&W's output gradually declined in quality throughout the Bangor Punta era until about the late 1980s.