I like the both, PSM and UMS and I am glad when the best from both are mirrored to each other as I always did when I wrote some little code. But your comment mazey seems little bit not objective
In past SubJunk already stated the reasons why he forked it. Today I read it also here, well described:http://sourceforge.net/blog/march-2014-potm/
I have installed both but will not write here which is better to not make flame for any side. It is upon users what prefer.