I always make sure that we are actively using Bing and Google. There is a tradeoff in your time when you use more tools, but there's also benefit in multiple perspectives. And don't forget that Bing is a very viable search engine that receives 500 million search queries each month. You may find that your business benefits from a relatively small amount of attention paid to Bing because search ranking there is easier (not easy, easier).
SE Ranking is a fantastic tool if you are a marketing agency or freelancer looking for a single tool for the majority of your SEO work. It also includes B2B tools like their lead generation widget and white label reports that can help you generate new leads for your business. It would get 10 stars if their database was larger to accommodate research for small geographic areas, but they are always expanding their database so it may just be a matter of time. Research SE Ranking has pricing plans available for every budget.
The user-interface isn't as friendly or appealing as Google's - very bland overall.
The way they present their Page Traffic report is a big turn-off. It's basically just a grid of numbers and arrows which is hard to interpret at a high level.
Very usable overall, quick to find information and conduct analysis for example of how a price of content is performing on Bing search. User interface is a bit clunky at times but easy enough once you get used to it.
The support is great but they don't have 24/7 support. And time zones can also be an issue sometimes. On the other hand there are plenty of guides and videos around to get yourself started. I never really needed support for "big" issues. And the help I got was good enough.
I think that Bing does a good job of being a competitive product in a space that has very basic and insanely complex products. While Bing isn't pretty, it gets the job done and also gets you the right tools in a simple and straight forward backend UI. The ability to place Bing ads, track SEO and see how your site is performing, all from one backend interface is awesome!
SE Ranking is better than Serpstat or MOZ or Ahrefs when it comes to tracking keyword rankings, but it lacks in every other SEO category, such as onsite and offsite SEO metrics, content analysis, etc... It's a good choice for agencies that are interested in tracking keywords for their clients, but other than that it underperforms in every other SEO category.
The website "health" report has allowed us to fix things that Google might find strange or cause us to lose rankings, which has been very helpful.
It's given us more visibility into what exactly our SEO management company is doing and how they are performing, and if things are changing or not. It's very easy to see right from the dashboard.
Being able to see how our competitors stack up against us has helped us know where to improve, what to focus on, and how to be even better.