Any c++ devs here.which is better for drawing graphics on a window
Sdl + open gl or using sfml

Define better.

@ItsNotMyFault better as in
which one is more easily integrated into open gl

Can't you just use open gl in your project?

I'm not fully up to date here, but I prefer SFML's api if I'm building an entire program. IIRC, you can drop to opengl fairly easily if needed. The documentation had some good examples when I last checked. The advantage over SDL is that it's designed for C++ instead of SDL, which is designed for C.