I have a Kindle, but bought my daughter a Sony Touch Screen. It all depends on what books you want to buy/receive. I like independent authors, so the Kindle was a good choice for me. There are many free Kindle books, but most are not the "big name" authors. Purchasing books for an ereader by well known authors costs about the same as a hardback or paperback which can be expensive. My daughter likes a wide range of authors, including well known authors, so downloading from a library was a good choice for her. The Kindle will likely never be able to download library books. Non-copyrighted books, such as the classics, are available in a wide range of formats for free, so if you like classics, any ereader will support them. Even though I have a keyboard on the Kindle, I really liked the touchscreen of the Sony.
Good luck on your choice! An ereader is wonderful technology!