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It's basically the same thing. The brackets ( ) are used by some people to try and add clarity to the writing on the page.
Seventh chord here (altered extensions here)
sorry, i don't get it. maybe cause i'm a noob here.
doesn't the Bb7 already have major 5 inside? or does the +5 actually means an augmented 5th?

No, no to "Major 5".
What you are referring to is called "Perfect Fifth".
On the short list there is Perfect Unison, Perfect Fourth, Perfect Fifth, Perfect Octave.
When a Perfect interval is raised a half-step, it then becomes Augmented. When it is lowered a half-step, it then becomes Diminished.
I've seen: Bb7+5, Bb7aug5, Bb7(+5), etc.
And, I've seen: Bb7-5, Bb7dim5, Bb7(b5), etc.
It's all over the place with names -- just learn 'em all.