They each have strengths and weaknesses, so no clear winner. Depends on whats most important to you. Zenith for example doesn't work with closed-captioning on most channels while Samsung does work for CC.
I am using the OTA Samsung SIR-T165 STB via DVI connection to a Fujitsu P50XHA10US plasma. There is a marked right shift to the picture with this connection. Adjusting the Horizontal control on the plasma to its maximum does not fully center the picture. I have called Samsung and they told me this was a known problem with the DVI connection, and that there was no fix available. Read the SIR-T165 thread in the HDTV Hardware forum for more info.
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