Well, might as well keep going.
The Yogscast may be funny at times, but they don't give recipes, they cheat in items, they swear a lot and play on a Modpack that is frowned upon by Modders.
This, in my opinion, rounds the Yogscast to "Funny-at-times cheaters". Call it bias, call it stupid, call it whatever you want.
Now, onto Direwolf20. His videos are informative, a bit long at times, he doesn't cheat, and he's family friendly with language. He also knows a ridiculous amount of Modders. Also, he has Forestry, which is one of my favourite mods. And yes, I know what happened with Sengir.
This, in my opinion, rounds Direwolf20 to "Family-friendly, fair and a bit long." Again, call it bias, stupid, etc.
I can't see a fault other than timing in Direwolf. He is a terrible actor at the end of his let's plays though, and he does cheat a bit, but not much. You could see a few endermen spawners in his inventory. Hehe. The Yogscast's language I don't like. I also don't like how they drift off into nonexistant and unfunny sidestories, such as Ben the Dancer or something in the end of Sips + Sjin's "finale" of their "first series" of Tekkit, which they cheated massively in.
The end.