Presentation/accuracy is all Shinsen, but I can't honestly say I've been paying attention to video quality on the sub releases. They may indeed have inferior video. AiA-IZ has really stepped up since episode 4, and episodes 5 and 6 have been really solid. Gattai is generally accurate, but it suffers when it comes to readability. Lunar is heavy slang and what not, I found it to be a real turn off. The AonE-Gekkostate-whatever release is pretty sub par as far as the translation goes.