[sdiy] S&H question

[Scott Juskiw]

Looking at some old schematics I see that many sample and hold 
circuits use an n-channel FET (typically 2N3819) to sample the input 
signal. When I look at more recent schematics I see these new fangled 
bilateral switches (CD4066 or DG213) or purpose built S&H chips 
(LF398) being used instead of a FET. I've only used a FET in the past 
and have been reasonably happy with it. Are these bilateral switches 
or LF398 really that much better? The application is a ribbon 
controller.