I worked with QARun for a very short time. More a WinRunner specialist. Still I would say I had to go for WinRunner for web-testing. WinRunner is more flexible approaching objects GUI-map usage is optional. Especially useful for dynamic content.
If all you need is a good capture / replay tool try "iOpus Internet Macros" (http://www.iopus.com/iim.htm ). The software is very flexible and very easy to use. The only drawback that I found so far is that it supports only IE.