MikroTik is suited for large companies that require advanced distributions in terms of contracted bandwidth, and in the same way, allows a single device to specify filtering and firewall rules without acquiring an additional device. There is a range for small companies which is more economical and less robust, but in case it's not necessary, such a strict control over the data consumption of the company is not a feasible solution.
WatchGuard XTM comes in different models, so you can choose the model best suited for your company size. I think it works well in small as well as very large networks. I have not used this feature, but you can create a "FireCluster" to connect member devices of the same model if you need to put multiple WatchGuard XTMs in your environment. Coming from command line, it took a little adjusting to learn which screen to use to set up the different rules. Once you understand how to set up policies, it is simple to create more. New firewall administrators would appreciate the ease of creating policies, and expert administrators should find everything they need plus extra features.
Some of the wiki articles have not been updated or are not accurate enough. We spent a couple of days trying to find an example of implementing a mobile IPSec client solution. But once this has been implemented, it has been solid (always worked). A bigger community would help, and I am finding it hard to find the time to contribute to these articles.
Support can be hard to work with. While they are typically knowledgeable, there can be a language barrier. Also, most troubleshooting seems intrusive which is a problem in a production environment.
The throughput of the cheaper models leaves something to be desired.
Have had some issues running VOIP behind these, but have not been able to narrow down the issues to the phone provider or WatchGuard yet.
There is no SOC, NOC, where you can contact to try to resolve any difficulties. The problems that these devices have are solved largely through the community, with workaround alternatives, or if the support team responds to a request, the response times are too high for the current needs of technological communications.
Cisco Routers are one of the best in the market, however they are also very expensive and not suitable for a small deployment or any deployment which requires just a couple of routers. MikroTik on the other hand are less expensive and provides many features that you require for a small scale deployment. they fit in with the budget and do what you need them to.
Again, WatchGuard is priced much lower than other vendors in its space. It may not have some of the bigger features such as Layer 7 awareness. It's more simple to manage and provides IT staff the time to work on other tasks versus time spent to create complex rule sets.