Join Date: May 2002
Location: Toronto, Rogers, 9865 & 8300-eHDD, Sharp LC75N8000U, Denon AVR4310Ci; Sony KDL40W3000, 9865
Regarding the video, some HDTVs have certain limitations on the PC inputs - say 768P, while most 1080P HDTVs with HDMI will accept 1080P via HDMI. You need to check for each make/model of TV, so one cannot generalize.
Regarding the audio, if you're connecting directly to the TV, due to the quality of the TV speakers, I doubt there'd be a difference.
IF you're connecting "through" an AVR with HDMI audio handling, and if the laptop can send HD audio from say BluRay, then the HDMI connection could be superior. (I don't know if laptops have this sort of capability.)