In my opinion the 16-35mm focal length would be too short for everyday walk around lens. It would be good for wide angle and group shots but wont be good for portraits and head shots as focal length is not long enough.. between the two of these the 17-55 would be more suitable for your needs.

My first walk around lens was a EF-S 18-200mm 3.5-5.6 Lens which i found was very useful but it is not comparable to 17-55 in image quality as the 17-55 out performs this. the only advantage is 200mm focal length and was around $400 cheaper than 17-55 and I follow the principle that an average shot is better than no shot at all, so rather than getting great shots at 55mm max I opted for average shots at 200mm.

I did buy the 17-55 later and found it great for indoor parties, weddings as it performs great in low light.