Hair extensions...clip ins help?

I'm debating on whether or not to get the 120 grams of foxy locks clip ins or just buy 2 quad wefts from head kandy. I already have some 14 inch clip ins I made myself but I was planning on getting 18 inches of head kandy. Should I get the full head from foxy locks or just buy 2 quad weft from head kandy and use the clip ins I already have to fill the gaps?