hey, how are you going with your project? did you already decided how to do it?
if not, I suggest you to use raspbian and python, you can make a small web server with python FLASK and combine with GPIO or python SERIAL to read your sensor in the same program (to avoid threading if you're a beginner)
another alternative is use node.js and express to make your web server (but how are you going to read the sensor?) I think I have seen wiringpi examples in node. if you don't know node.js maybe you can check node-red which is a graphical interface (and I think last versions of raspbian comes with node-red pre-installed)