Dear  Sir,     I am not cytologist   ı  could not   not  answer  realy.   ı  found  for  you  this. Cell polarity relies on the asymmetric organization of cellular components and structures. Actin and microtubules are well suited to provide the structural basis for cell polarization because of their inherent structural polarity along the polymer lattices and intrinsic dynamics that allow them to respond rapidly to polarity cues. In general, the actin cytoskeleton drives the symmetry-breaking process that enables the establishment of a polarized distribution of regulatory molecules, whereas microtubules build on this asymmetry and maintain the stability of the polarized organization. Crosstalk coordinates the functions of the two cytoskeletal systems.

Kinesin-1 acts as a vesicle motor, and typically the connection between the vesicle and the microtubule involves only a few kinesin molecules (2-4?), depending on the size of the vesicle.  If kinesin were not processive, then the vesicle would keep dissociating from the microtubule and transport would be very inefficient.  In contrast, myosin II motors are bundled together into thick filaments and cannot diffuse away from the surface of the actin filaments.  In fact, in most contractile arrays each thick filament is surrounded by thin filaments (and vise versa).  Because so many myosins engage at one time, none of them need to hang on very long. 

Similarly, axonemal dyneins need not be processive because they are physically trapped near the microtubule surface, whereas cytoplasmic dyneins need to be processive to function as vesicle motors, and so have evolved the dynactin complex to increase their processivity.