If your current company is not employing you now (maybe in 6 months), but still willing to help you extend your work visa for another 3 years, then as long as you don't feel guilty about breaking the law, and your company is fine to lie and state a salary that is false in the renewal letter that you submit to immigration, then this would probably be a better and more versatile option in case your wife had problems with her job in the future too, so then you can rely on each other for dependent support should you need it.
But if you prefer to not break the law, then you should apply for dependent of your wife.
Since you only have one month before current visa expires you should decide and apply now.