I have not seen the Zenith...but the 27" Samsung (HDTV 2798) is incredible. I just posted in another thread about this TV. I love the picture and the sound. And to have HDTV as a possibility is fantastic. I went through the Sony and Panasonic and finally the Samsung, it really was saving the best for last.
I could not be more pleased and I am ultra picky when it comes to TV's. Good luck bud!
I've been looking at both of these and I know a big plus that the Samsung has is that both Component Inputs are autosensing and the ones on the Zenith are specific, 1 for 640p and one for 1080i.
I have the Zenith and am quite happy with it (I started a topic on it in this forum a few weeks ago). There are a few little things I wish were better, but for $699 you can't beat this TV. I didn't know about the Samsung - wish I had because I could have done a little more comparitive shopping.
What do you specifically like about the Samsung? Are there any reviews you could reference? What I'm looking for is a 27-32" HD-ready 4:3 set with vertical compression and maximum width less than 34" and depth less than 24". And it must be flat screen. From the specs online the Samsung meets all of these requirements. Just never seen one properly calibrated.