It sounds like you want a “wall wart” style charger that plugs directly into the wall and has a USB-C cable from there. In that case, there’s no reason not to get a charger separately. As others have alluded to, I’d recommend a quality charger, but as long as it conforms to the USB PD standards, it should work just fine.
As far as benefits to the FW charger, it does have a couple, as far as I am concerned. First, I like that it has a cord from the wall to the “brick” because the plug doesn’t take as much space up when plugged into a surge suppressor or just when used it tricky places in general. I also like that it provides a few extra feet of length, without having to buy a longer USB C cable. Also, being a GaN based charger, the “brick” itself is quite small for a 60-65 watt charger. Neither of those things are unique to the FW charger though. If the price/features of the FW charger fit your needs, that’s great. If not, there’s no reason not to get something else that will work better for you.
A “tingle” sensation may be felt when touching the exposed metal portions of the notebook and/or 2 -prong AC adapter when the AC adapter is plugged in. The “tingle” sensation is not an indication of a failed or defective ground.
A 3-prong adapter is one option to eliminate the “tingle” sensation. The other is to change some of the environmental factors involved. As an example, the “tingle” sensation won’t happen when running the notebook on battery power. Also, you can eliminate the “tingle” sensation by connecting a grounded peripheral such as a USB printer or other device that uses a 3-prong adapter to the notebook.
One thing I like about the official FW charger is that it supports multiple charging voltages over USB PD (5v,9v,15v, and 20v). So while it’s a weaker than a 120w Dell charger for example, the FW charger can charge multiple different laptops and smartphones at fast charging speeds, while the Dell charger simply doesn’t support devices that can’t run on 20v.
Yeah, it’s a recurring theme on the channel that 65W chargers tend to lack power factor correction, which he really likes to see. Some 100W chargers employ the technique even at low power levels, but I can’t recall a single video where he’s tested a 65W model with the feature.
The reviews are all various shades of pointing out the weaknesses of each charger and this one was indeed pretty positive overall. Not positive enough that I’d buy one if I wasn’t buying a computer, but enough to be very comfortable using the one that came with the computer.