Hi Carlos! Yes, those sounds fine to me. As someone from the UK, I often hear 'however', 'then again' and 'whereas' used as alternatives to 'on the other hand'. I hope this helps 🙂

Hi Carlos. Both are good, however, 'on the flip side' is a slightly better alternative. 'For one thing' can be use to point out a fact or a reason, but not always as a counter argument to what has already been said.

I agree with Adam with the use of “for one thing” because that usually highlights/focuses on that one thing whereas “on the flip side” may be used to express a contradictory statement. So “on the flip side” could be used to substitute “on the other hand” “contrary to that/on the contrary” “inversely” but these are more formal.

I think it depends on the broader context of the sentence and your thought that you intend you articulate. However, in addition to the ones mentioned above, we also use whereas.