Yes and no. Alot of things is subjective that's true, but there are times, when one thing can be better than the others (depends on factors of course).
To say no one is better than another person in doing a thing, or no product is better than the other, is only 'political correct'. Its often a means to avoiding comparison.
Chelsea (leader in Premier league) is better than Liverpool (6 or 7 position) currently.
Its perfectly fair statement & no one should be worry to say this. However, that doesn't mean you are dumb to support Liverpool, or Liverpool fans are losers, & should start supporting Chelsea. There is a word for such people, Glory hunters. Also Chelsea fans should be classy & not mock Liverpool fans. You can be fans of either club & exercise mutual respect.
It will be sad when we cannot express our real opinions & choose a more political correct answer, either not to upset people, or avoiding backlash or personal attack.
If we want to have a comparison thread, then we must accept that people can say they prefer one over the other. If we disagree with his view, then we should provide reasonable, counter-arguments (in a classy manner). People can then discuss with an open minded from both side of the arguments.