It is the cheapest of them all, retailing at S$10.99 on Lazada with free shipping to Singapore.
Specification-wise, it supports the usual Power Delivery 3 (PD 3) / QuickCharge (QC 4) and is capable of 5V/3A, 9V/2A, 9V/2.2A, 12V/1.67A, and 15V/1.3A output.
Interestingly, this charger has “Super Si”, which I think is Baseus’s version of GaN. Super Si offers the same advantages as GaN like smaller density, better thermal conductivity, and more efficient energy conversion.
It has the 9V/2.2A output which is required by Apple’s MagSafe Charger.
I would say the major difference between this charger and Ugreen and Apple 20W charger is the design.
The design of Ugreen and Apple 20W has a flatter profile and is meant more for wall sockets as the USB-C port will be facing downwards.
Baseus 20W charger design has a taller profile, and hence it is designed to plug into an extension strip placed on the table. If you go with that orientation, the USB-C port will be facing up, allowing you to easily plug/unplug the cable.