Milwaukee 18v Lithium here. 1 each normal and brushless and happy with both. I had ( still have ) an 18v Dewalt NiCad before (10+ years)..the batteries no longer hold a decent charge but it has more than paid for itself.
I give my tools a lot of hard use and will always choose one with a metal chuck.
The batteries for the Dewalt gave up on a job and TP had the Milwaukee on offer at the time. If I had not of had to source an immediate replacement I would of chose the Hitachi DV18DSDL which has 90Nm of torque.
Metabo make quality tools also.
That Festool shown above looks cumbersome to me and is probably the ugliest cordless ever made.