D&D 5E (2014) GDQ All in One or Separately?

[aramis erak]

I have another related questions

I have the pdfs of G1, G2 and G3, but there's also an all in one G1 to G3 Against the Giant module that combines them all. Would this one be a better option or should I go for the individual G1, G2 and G3 adventures?

There are separate G1 G2 G3, the G1-2 & G3, the G1-3, and combined GDQ. I've found that the combined ones are the easiest overall, but the difference is very slight.