in the shell

I've finally finished the first manga which I'm so glad I did. It was like discovering GITS all over again and makes me appreciate Oshii's vision that much more.

Obviously 1.5 is set between 1 and 2 but as it was written afterward does anyone had any recommendation on what order I should read them or does it really not make a difference?

I reads them in 1, 2, 1.5 order and didn't find that too bad. 1.5 is so episodic that it felt more like filler material that could fit anywhere to me.