Get an Indivision, it will provide crystal clear quality. SVideo adapters show a more blurry image (something in quality between composite video and RGB/Scart). Just look at the icon fonts of the screenshots.
And let's not talk about degrading smooth 24bit gradients into horrible 15bit gradients... Indivision is the best flickerfixer. It even allows you to configure your video output to 50Hz if your monitor allows that to get perfect scrolling.
SVideo + vga box = blurry pictures + jerky scrolling + poor ocs-like gradients.
