My opinion is that it is hard to say which method is better, because it very much depends on what situation complainer is in and that each method has its own pros and cons.
I prefer if you remove the part - '' hard to say which method is better'' .... it does not seem to add much value to your idea and also it disturbs its flow :(It also enables
themone(since you used 'he' in the earlier sentence, keep this singular) to avoid unpleasant
conversation .
confrontations.-------- confrontation is a better word to use here.For instance,
suppose that you area man is on a business trip in a foreign country
and you find your mobile service provider has not activatedhismobile phone cannot useroaming service on your mobile.tT hen writing a letter is an excellent way to complain and
ask therequest your service providerMobile operator in
hisyour country
to enable that service for him.activate the service immediately.If one has complains
------- complain is the verb while complaint is the noun. So ;If one has complaints. If one has complains about a company's product, he/she will receive answer and explanations right away. He/she doesn't need to wait for the company's response which often takes several days or even a month by sending a company a letter.
Say this a bit differently keeping a close link to your reason;
This method helps when one expects a quick response from a company with regard his/ her complaint about a company product. In this scenario, writing a letter would not meet his/her expectation because the company may at least take several days for its response to the letter.both complaining
--------- both ways of complainingChoosing which method to complain is very much dependant on the situations in which one is and depends on how he/she wants to do it.
-------------- good ending :)depends on how he/she wants to do it.
----------- how he/she wants to handle it.