Name the metrics for selecting top algorithm

There are a number of metrics for selecting top algorithm:

i) Computational complexity: Computational complexity refers to efficiency. The processor time increases as a function of size of data structure. But small factors of inefficiency are unimportant if they improve clarity.

ii) Ease of use: a simple algorithm, which is easy to use and understand, could be used for less important operations.

iii)  Flexibility: The fully optimized algorithm is normally less readable and very hard to implement. The solution for this is to provide two implementations of the crucial operations: 

• A complicated but very proficient algorithm.
• A simple but unproductive algorithm.