The Lounge is rated Safe For Work. If you're about to post something inappropriate for a shared office environment, then don't post it. No ads, no abuse, and no programming questions. Trolling, (political, climate, religious or whatever) will result in your account being removed.
Do you need unstable (non-persistent) or partial drawing, buffers, dynamic scalar image generation (opposite as vector image generation), layers or 3D? Then use canvas. For all other simpler cases use SVG. None of those technologies is superior - SVG is simple to use for simple use cases, Canvas is simple to use for advanced use-cases (and difficult to use for simple use-cases).