IMHO, the 2.5A official supply is getting a bit iffy with a 3B**+** and Pi Foundation display etc. I also have an analog audio amp and few other odds and ends attached to my display and 3B+. I usually run the 10A power pack as this is my bread board rig. I could have motors and or servos etc wired up. The 4A power pack I bought for another project and tested it to see if it was enough when the 3A wasn’t. Just wanted to know if 4A was enough for future reference. I only used the 3A because it was handy at the time. Won’t be using it for my bread board this Pi any more though.
The other reason I went with the barrel connector on that project is IMHO, its more robust. Only one way to plug it in, and its easy to plug in. No having to look to see if its right side up or upside down, or mangling it if you get it wrong.