What word(s) would you use to link two arguments that respectively agree or disagree with a statement or situation given in the writing section of a Unit 3 exam?

There are different expressions you can use to connect two paragraphs that express opposite arguments, such as "sin embargo", "no obstante" and "por lo contrario". The use of the first two expressions is equivalent to that of "however" or "nevertheless" in an essay written in English, while "por lo contrario" directly translates to "on the contrary".