Crystal = Big footprint, huge deployment, fast, good designer and support
MS ReportViewer = small footprint, slow, bad designer, support.. well, not so damn easy to search after reportviewer, a name all uses.. sigh.
I actually find the report designer in reporint services very easy to use and can get it to do most things. I also don't think performance is that slow. The only times I have had trouble have been embedding reports in pages. In contrast I find crystal to be very tempremental.
Interresting.. I'm using the designer inside Visual Studio, and have one report with about 300 cells in an table, that report alone uses 1min 35 seconds only to open in design... The executing performance is excelent though. But if you get around 800 pages.. it get problems, which crystal did not..