I have the Galaxy Tab myself, and really like it, but I've also played with an Eee Transformer and was very impressed. I previously had the Xoom, and it was okay, but it's screen wasn't as good as the former two. The 10.1" Android Tablets have higher resolution screens than the current crop of iPads (1200x800 vs 1024x768), meaning a slightly higher DPI, meaning slightly easier on the eyes for reading.
Honeycomb gives you lots of flexibility as to how you get PDFs on to the device (e.g. via Dropbox, local file transfer, etc) combined with the freedom to then view those PDFs with the app of your choice. Android has a version of Adobe Reader, which while feature light, is pretty much guaranteed to correctly render any PDF you throw at it. For my own purposes though, I typically use RepliGo, which handles most things, is notably faster, and lets you view and add notes in PDFs.