Quoted from QuietEarp:"Best" is a hard question. I bet Yellow, Red, and Blue are all pretty close. I use mine for work, I wound up with Dewalt because they had a good price. If it is just for casual home use I would go cheap and get Ryobi. I have some 12V Milwaulkees that are great for small tasks.
By "red" I hope u meant these guys! Haha, I use makita as well but only because I have 5-6 batteries.. Hilti is nice stuff tho! All my lasers & drywall tools are hilti. The lil impact driver is a beast too!