From SEM image, we can confirm surface morphology, size and agglomeration tendency of paricles whereas, HRTEM allows the direct imaging of the atomic structure of the sample.

thank you , it is STEM not SEM

By both, HR-TEM and STEM (bright field or dark field) you can reach atomic resolution images of your nanoparticles. The basic difference is in way of primary beam interaction with matter and thus the types of dominant contrast mechanism. One of the consequences of different contrast mechanism is, the high-resolution STEM images does not need additional computer simulations and images can be interpreted directly from image.

Your question is too broad and maybe you should take any TEM book and read few relevant pages ;-)