Canvas is a lot more fun because it adds a level of playful interaction (stickers) and brings along a known-for-lulz community (4chan and by proxy Reddit) that Makr.io doesn't. My problem with Makr is that if it's trying to create memes, not only is the audience terrible at choosing photos, but the design isn't even using Impact (which may seem silly on the surface, but ensures the content is read to be funny/sarcastic).

In this sense, it reminds me more of an LJSecret's Pinterest, and these two audience types don't blend well together at a social level, so I'm not sure how a a platform catering to both of them will do over time.