Since my background was aviation electronics/electricity the local electric contractor let me to DIY wire my home.
I exceeded code by a lot.
Used only 12 gauges everywhere, split all kitchen outlets to the extent that I have 12 breakers for kitchen alone (for 6 outlets), LOL wife can plug as many appliances as she wants anywhere.
1/2 the kitchen is wired via my generator transfer panel so we can cook anything during outages.
My shop/garage has a sub panel, again all 12 gauge and 220 for welding. Outlets every 4 ft and at waist height.
Shop lighting is on its own circuit so as to not be in the dark should I blow a breaker.
Just recently I have been switching all my lighting over to LED's.
When U buy spools of wire there is a minor difference between 12 g and 14 g.
Oh, and no aluminum wire ever for me.
GFI's where ever code required them.