I have seen apps that read CHM or PDF but not both. I need an app that reads PDF as well as CHM quickly and smoothly. I tried OliveOffice but there are issues with landscape mode. Is there any other ?
Moon+ Reader reads chm's and almost anything
You could convert your PDF's to CHM:
As you said OliveOffice
or have you tried: iReader
Here is an e-book reader list if you want a 4th option: