For questions in which the requester is asking for an opinion, such as this one, is it permissible to add your opinion even if it's similar or identical to another answer?
If it's very similar or identical, then no - upvote the relevant answer.
If you think you can write a similar yet better answer, by all means - go for it! The community will judge the two similar answers over time. Eventually (after a month+), it might be nice if the owner of the more unpopular answer deleted it, but that isn't necessary.
You can also edit another answer if you think that it just needs a little enhancement. For example:
- Add an explanatory link
- Reword an awkward statement
- Fix spelling