If stabilization is key to your work, the 15-30mm is the way to go. If it's not, you should think about some other options. The Sigma 14-24mm F2.8 DG HSM Art is a better lens at the same price, and even if you don't use a high-resolution camera now, it will hold up better in the future if you...
Bright f/2.8 aperture; Optical stabilization; Ultra-wide angle of view; Full-frame compatibility; Fluorine coating and all-weather build
Only sold in Canon and Nikon mount; Bulky; Image quality suffers on high-resolution sensors; Heavy barrel distortion; Nikon version doesn't support rear filters