I haven't tried duct tape but it would depend on several factors:

1. Which grade of surgical tape? It comes in everything from fancy msaking tape to cloth w/ white adhesive that won't come off easily until you take it off and then you still have to get some of the adhesive off.
2. What environment will it be in? Skinned knee on hiking trip or working on rescue crews in a flood?
3. How often will the dressing need to be changed? The answer for this one will also have an impact on 4.
4. How large and how hairy is the site you stick it to? The duct tape will have a better chance of staying stuck but you may wish it hadn't when you go to remove it. <img src="/images/graemlins/shocked.gif" alt="" />