what is the best apple product to edit photos and make iMovies

It's like asking who has the best coffee. You are going to get a lot of different answers.

GraphicConverter is a very powerful photo editor with tons of features.

You should probably start with Photos and iMovie, since they're free; then, if you need more features, check out the App Store and see what else might work for you. I like Pixelmator for image editing.

Matt