Did a quick check at Fotolia, just for fun. I checked the best-sellers this week and this month. 60 clips.

This does not take into account actual number of sales for each clip, just which clips sold. They all must have sold at least twice though, since I have a clip that sold 2 times this week that is not on the list.

23.98/24 - 20%

25 - 48%

29.97/30 - 27%

60 - 5%.

The top 3 clips monthly were all 23.98/24.

The top 3 weekly were 1 24, two 25.

I don't know the distribution of the different frame rates on the site. I can't even find a way to search by frame rate so they obviously don't think it's important at all.

One can really go crazy trying to overanalyze this stuff, I know I almost have. I even used to submit 25/30p versions of the same clips at first but decided it's not worth the extra time.

Now the ultimate question: ProRes (Standard) or ProRes HQ? 

My main question is which one is the most international one? ntsc or pal? 24 or 30 fps?

Just to be clear - PAL is 25fps and not 24. Though I guess you know this by now from all the other contributors' replies. I generally stick to shooting in 25fps because I live in a PAL country (Australia.) Though not too long ago, I acquired a GitUp action camera for my quadcopter which only offers 30fps as a standard frame rate. So looks like I'll be forced to use 30fps for aerial footage. Some say there's less chance of flicker when filming at 25fps under fluorescent lighting but I believe your choice of shutter speed will also help significantly under those conditions, regardless of what frame rate your recording at.

Years ago, I used to shoot on motion picture film on a semi-regular basis. When shooting on super 8, I'd switch between 18fps and 24fps. When shooting on 16mm, I'd use 24fps exclusively. By the way, my Canon 1014E super 8 camera has a 54fps setting for beautifully smooth slow motion.