So I've gotta say its made great strides recently, but when I hear pop music for a long enough time it inevitably makes me angry with the music industry and its production. There is good, and bad pop music, and if its on my own playlist, or one of those rare stations that just plays the good stuff regardless of what time, or trend is going on then I'd say either works. But in general, the producers in the pop industry and their reputation make it harder for me to focus on studying. A lot of stuff is actually made by the same small groups of people, and just sold through the band, and it bothers me.
Classical music like Fur Elise by Beethoven can make you feel calm and peaceful. Classical music can make you concentrate on study. Research shows that classical music is the easiest to enjoy. Classical music don't just can concentrate on study, it can also use for meditation too. So classical music is the BEST type of music to use for study.
You're asking the wrong question. The way you asked it, you're asking for people's opinions on what they would rather listen to while studying, instead of looking up what kinds of music are best to listen to while studying a certain way. You'll also be disappointed to know that the difference is virtually invisible, and the gap is so insignificant to matter. Hell, the small gap could be changed depending on the genres you pick and your opinion on different genres of music.
There is Google for a reason, and if you look into it enough, it will be obvious if it's a legitimate source or not.