Curious why you're upgrading.
I've never changed an extruder in any if my 6 printers, and I generally print faster than mist people.
Getting settings and filament right makes a lot more difference.
The BMG style are okay, but no real improvement on a traditional style mk8

You can't shortcut learning how to use slicers and understand how different filaments work by just changing hardware
And until you do learn those those things, nothing you do to the printer will make any real difference.