There isn't a huge speed difference unless you are playing games or using software that requires graphics acceleration. The biggest advantage to Boot Camp is that just about any Windows software should work, and all device drivers should work correctly.
I have found Fusion to be much less responsive from my experience. As for Parallels having "bloat", considering that around 90% of the requested features for Fusion on the Fusion support board are features that Parallels has, it looks like most future features of Fusion are going to be "bloat".
If you are considered getting virtualization software I would recommend that you try both Fusion and Parallels because both provide free trials.
I would recommend NTFS because there is
backup software that you can use on your Boot Camp partition if it is formatted NTFS, and when you run your Boot Camp partition through Parallels it will mount your Boot Camp partition read/write on the desktop. There is also software you can get to read/write to a NTFS partition in OS X, but you would have to run it through the terminal.