Confused Between HDD and SSD?

The simple answer is yes select SSD.
In the present world if you want a slow computer then you can definitely buy a HDD computer.
But then you would ask why is SSD faster than HDD or why is HDD slower than SSD. What are the benchmarks to say that.
Well first of all SSD has no moving parts. Second, its smaller than HDD.

HDD

SSD