I am a paying Tweetro+ user and the simple advantage of the official Twitter App is its speed. It is lean and mean. I do not like that it is missing autocomplete functionality for @mentions and it could use an autocorrect function but the program is simply fast on my RT. In snap mode it is not touched by another available program that I know of. For a 1st version, this app is a solid winner.
I would hesitate to call it basic. It certainly is not complete, however, it executes very well and very fast. I think it performs in snap mode better than any programs out there and its handling of embedded content and photos is certainly not basic. I am still using it and have not switched back to Tweetro+ yet. Oh and I like the commonality between it and its WP8 cousin.