This is a tough choice indeed. Both WM Recorder Bundle and Replay Capture Suite have the same video splitter, the same screen recorder, but their converters are different. Also WM Recorder is different from Replay Media Catcher, besides the Replay Capture Suite has Replay Music for recording any music from sound card (with auto song splitting and tagging) and Replay AV for downloading and recording radio programs mainly.

If you don't record music and radio, then the choice is between Replay Media Catcher and WM Recorder. WM Recorder is a more powerful recorder of Windows Media streams and Real Media streams. But Replay Media Catcher supports Smooth Streaming, can extract audio tracks from videos, can convert downloaded streams automatically.
Also RMC tries to identify downloaded MP3 music tracks. As for downloading and capturing HTTP and RTMP streams, now that WMR 14.8 has the loopback recorder, both programs can download and capture such streams, so they both can be recommended.

I suggest you to try demo versions on the streams that you usually download and see what works best for you. Also note that both WM Recorder line and Applian products have a 30-day unconditional money-back guarantee, and I can assure you that this is not just words.

Note that both WM Recorder and Replay Media Catcher can't download secure RTMPE streams. This is a limitation posed by DMCA, and forced by Adobe. The only commercial RTMPE recorder is GetFLV, which is being sold from China, but was kicked off from paypal, regnow,....