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In my opinion, if you must choose between those two, I would utilize .NET. It will integrate much more nicely with other parts of the Microsoft suite, and it is far easier to design a secure website this way.
However, I would recommend that you utilize Python instead if this is your first time developing a front end tool. With a little experience, it's possible to build functional websites in a week rather than a month. Particularly, Flask or web2py are excellent libraries for most front-end tasks.
I developed a tool for social media monitoring and I used Windows Presentation Foundation (WPF) which is part of the .NET framework to create the dashboards. I think it is very useful as well as very powerful. There are plenty of extension and packages you can download for UI, graphics, etc. Furthermore it is very easy to develop frontends using more than one screen.
