Best Product for Scratch Repair?

The quickest and easiest is the use of a "paint stick" available at most auto parts stores.

A paint stick is like a big crayon that contains a mixture of paint solids that you can apply as you would a crayon.

Just rub the paint stick over the scratch and gently buff the excess off until you've reached the level of the surrounding paint.

You could also sand and paint, or go to a detail shop and let them fix it for you.

Refer to youtube for additional scratch repair methods.

You can always get a free estimate at a body shop and while there maybe ask them what they use for small scratches or look up scratch repair on Youtube.

Absolutely the best way to repair scratches:

Rubbing compound and a buffer