Allegro

What do you guys think about allegro?
I want to study this shit,but I don't know if I should go with 4.0 or 5.0;

Is allegro better than SDL?

>>14
glut greatly simplifies initializing window and opengl and makes it easier to learn.
>>15
if you have zero C/C++ experience I would suggest you to postpone opengl until you are good at them