"Is NTFS safer and more reliable than FAT32 for MacOs X?"
Since NTFS can only be _read_, I'd say the data is safer, yes, because you won't be able to alter anything from within Mac OS X - unless you happen to reformat the drive, of course, but then the disk's original format doesn't really matter, anyway. Could you _please_ specify what you want to _do_ with the disk? If you only need to be able to _read_ from it on Mac OS X, I don't think the format _matters_, really.