I know for me I didn't know of TW Blue before I downloaded the free trial of Chicken Nugget, so maybe that's a factor too.  I do like the YouTube support in app for Chicken Nugget, but I like TW Blue better overall and if that's going to be updated in a stable release later down the road then TW Blue is the superior option imo.  I'd love to be able to do what you do on the Twitter browser and use emojis and be able to @ mention without having to type in the full name, but tiny things that I'd just go to Twitter itself for to use if I absolutely had to.