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pSX stretches out the picture with bilinear filtering to any resolution, SSF only uses bilinear filtering inbetween scanlines (eg. only some minor vertical filtering, but no horizontal), without any stretching to higher resolutions. So, pSX can do 1280x960 with filtered stretching, SSF will never go above 640/704x480, and when filtering it only filters the 240 vertical pixels to 480.
Also this probably doesnt look too nice when stretched by an LCD monitor.
For Tv-out, older graphic cards used to have standard s-video and composite out next to vga, nowadays they have a propietary 7pin s-video connector with custom pinout, with supplied converters that split this to composite/component/s-video out.
Some models drop the s-video completely in favor of hdmi, though. So, it depends on your videocard.
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