Compare and contrast at least two (2) operating systems | Computer Science homework help

Compare and contrast at least two (2) operating systems that are available today for use on personal computers and / or mobile devices. If you were considering the purchase of a new computing device (i.e., desktop, laptop, smartphone, or tablet), explain which one you would select. Then, include three (3) reasons as to why you would choose that type.

We could define a variant of McNaughton’s wrap-around rule for Q|pmtn|Cmax which takes the jobs in decreasing order of speed and also takes the jobs in decreasing order of processing time. It then tries to fill the first machine, and wraps around to the second machine if necessary, continuing through the machines in order.

Does this rule give an optimal algorithm for Q|pmtn|Cmax ? Why or why not?