If you are planning to hire an SEO expert to optimize your website for your business goals, you can use 3rd party seo tools as well to help you decide which search engine will give you the best results.
Optimizing your website for organic search traffic is one of the top ways to boost your organic traffic. Organic search engine traffic means that your website will not be affected by any spam or other illegitimate methods to rank high in the search engines.
These tools will help you easily determine which keywords will give you the best organic traffic. However, before you take the plunge and hire any SEO expert, it is important that you understand your competitors' techniques to properly take advantage of the market.
Tools provide information and data they don't make the right decisions for you. If you don't have the experience and skill to get the best out of these tools then you could be doing more damage than good.
Sometimes the information they provide isn't as accurate as it should be. They don't have access to Google's algo so there is an element of guess work in everything they do. From experience, you should always take the information they provide with a pinch of salt. The real proof of any SEO strategy is where are your pages ranking in the SERPS? Tracking SERPS positions is probably the most beneficial task a 3rd party SEO tool can do for you.
One way to avoid these problems of accurate interpretation of data is to use a professional SEO agency to help you analyze the information provided by these tools and also to help you establish a coordinated SEO strategy.