The following phrases can be used to write your subjective essay:

AB - The intent was to teach the concepts of service and include an interactive assignment to view service from the customer perspective. Concurrent with text and lectures, students were "mystery shoppers" in a pharmacy, bookstore and department store shopping for a fictitious 75-80 year old grandparent. Data was collected to assess each shopping experience environment. An essay focused on the pharmacy scenario, the five service components, and the design of an ideal pharmacy. Subjective essay choices indicated the most assured service was provided in pharmacies; most reliable, responsive, and empathetic in department stores; and best tangibles were offered by bookstores. Descriptions for an ideal pharmacy incorporated all components of service. The "mystery shopper" exercise illuminated service more vividly than text and lectures alone. Where service can be improved in a pharmacy was highlighted when compared to a bookstore or department store.

Still, it does not mean that your subjective essay can do without logical and clear arguments.

What the hell is going on here? And does the operating system business have a future, or only a past? Here is my view, which is entirely subjective; but since I have spent a fair amount of time not only using, but programming, Macintoshes, Windows machines, Linux boxes and the BeOS, perhaps it is not so ill-informed as to be completely worthless. This is a subjective essay, more review than research paper, and so it might seem unfair or biased compared to the technical reviews you can find in PC magazines. But ever since the Mac came out, our operating systems have been based on metaphors, and anything with metaphors in it is fair game as far as I'm concerned.

What subject for essays like that should you choose?

What a nonsensical, subjective essay Alex Epstein wrote ...

Many students confuse writing objective essays with subjective essays. In a few words, objective essays are based on facts and evidences taken from primary sources, scientific articles, etc. to support the writer’s opinion.