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It's probably just that more people have heard of reddit and can easier relate to rather than 4chan. Although it's probably unfair - I am using reddit for a few years and they have tons of amazing communities and le reddit army (swatters, Boston bombers, etc) are amazingly easy to miss unless you're looking for them.

4chan is a shithole without a visible record... reddit on the other hand not only has a record it has meritocratic system aka karma that promotes harassment and internet trolling "just for the lulz and karma"

I think it's funny that both of those sites seems to get represented by a more vocal and publicly visible subset of their users, and in 4chan's case by a slightly unfair-seeming set of associations between anyone using the term "Anonymous" (despite the fact that Anonymous is simply a name that one can take up without it implying any real link to a group), the one board out of many that is apparently implicated in anything "Anonymous" does, and the site as a whole.

Simply being obnoxious is not being a very good troll.