Team Science Kits Vs. Science Curriculum

Some things to consider when choosing what's worth your money while educating your kids at home are is this a kit I can create on my own with things I already have, if not is it worth the money I'm going to spend or would a lesson from curriculum be better fitting.
Here are some links to our favorite curriculum and some kits we've enjoyed.
www.invictuscl...
Let Nicole know we sent you!
www.jeannieful...
www.amazon.com...