I am a Max user but I would recommend to spend time on learning Blender + NifScope (in case you are modding exclusively for fun, future professional work requires knowledge of packages like Max): there are serious differences in using Max4/5 with official exporter and Max5-2010 with NifTools plugin; NifTools Max support is on hold now (no updates for nearly a year, but a new version of Max2011 was announced recently, btw Blender 2.5 alpha with several UI improvements was also released, no nif support so far). On the other hand several NifTools Blender developers are still quite active. Probably, OpenMW project would have also better Blender support.
Max UI is definitely easier compared with Blender but it is not that standard, e.g. Maya, XSI, Cinema have quite similar UIs that are different from Max.
Real program users would not start any debate wars because they do know what and why is good specifically for them.
I am not voting.