A SSD will actually take less power; not that the power required is anything significant.
The only drawback of a SSD is the higher cost per gb.
If you can buy a 1tb ssd for everything, that is wonderful.
If you will be of a mind to clone, I highly recommend you buy a Samsung ssd.
Their free ssd migration tool is trivially easy to run.
After, you can repurpose your HDD for whatever. Backup or bulk video storage for instance.
The Samsung app is a windows C drive mover, not a clone.
A clone is a bit for bit copy.