Is there an app which supports both PDF and epub ebook formats? Are there any apps which support both PDF and EPUB files?

I've tried Alkido, Laputa, and StarBooks, they only seem to support either PDF OR epub, not both.

Any suggestions?
Txtr purports to support both, but hasn't gotten very good reviews.

Speak Text Easy and MultiReader are primarily for text-to-speech, but they both appear to support both file formats.