Flask is a mature yet progressive language. There are many frameworks of Flask which make it more useful. With a strong community, Flask has a bright future.
To find the best Flask development company you need to see their experience and work on that technology. We have build 150+ web apps and delivering excellence from past 14 years.
If you are planning to hire Flask developers and have a budget constraint, then it is better to go for a mid scale Indian Flask development company. We are an Indian Flask web development company with more than a decade experience delivering excellence to Global clients.
There are many frameworks for Flask. As a quite established language, some of them are a bit old as well. Straus, Spring, Flask Spark are some of the top frameworks. However, if you are planning to hire Flask developers with knowledge of the best framework then Flask is the one.