I am working with both Django and Flask for more than 2 years...Although Flask is my go-to framework if I want to create any project or simple website to visualize my ML models due to its simplicity and customization(like I love to use MongoDB as my go-to database and remote availability in mlab), I agree with the fact that structuring become little bit problem if the project becomes bigger and bigger.
Said that, if you want to create something small quickly, I will suggest going for Flask. Like, when our semester results were declared recently, friends were finding it difficult to calculate overall CGPA of all semesters. So I was able to create this cgpa-calculator.herokuapp.com and host it on Heroku in just 30 mins.
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