Of your two option, 6-8-12 is better.

I think both 12 and 14 are really deep, what are you going to store in them? Mine are 6-10.5-10.5. I have utensils and such in the 6” then pots and pans in the 10

Mine are 6, 12, 12 on the front full overlay. On the interior: 4 and a quarter, 10 and a quarter, 10 and a quarter actual drawer with a 1/2 inch clearance each.

I have cooking utensils in the top, most used pots and pans in the second and large pots in the bottom drawer. I would not have it any other way.

My original plan was 6-10-10? Can you comfortably fit all pans, pots, and baking items with 10” deep? I would like to have the option of Verticall storing baking sheets. 7-7-12 is also a possibility. I will also have a left wall with corresponding lower drawers.

They have to add up to 30”. Your math is off. Realize that the nominal size is the drawer face size. Quite different from internal drawer size.

My cabinets are not full overlay.

I can fit my enamal Dutch oven in my bottom drawer no problem, it is 7” high. I also have a fit my ‘regular’ size stockpot. I do not have a tall,stockpot or canning pot to worry about.

Since you have so many cabinets, perhaps you could do the drawers next to the fridge in a different size configuration if youre worried about tall elements.

For cutting boards, baking sheets, I prefer a cabinet with door so they can stand versus laying flat in drawer.

Also, having a vent hood larger than the cooking surfaces is more efficient aar capturing steam/odors than when they’re the same size.

If you need some deeper drawers for vertical storage but want a symmetrical look, your cabinet maker could strap drawer heads together like this.

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Are those your only options? I have 5/7/14 on most of my drawers, plus one 4-drawer stack that is 5/7/7/7. I really like the 14" deep drawer for storing cutting boards, baking sheets, and skillets vertically - 12" would not accommodate those items. Also, for top drawers, my personal preference is that anything deeper than 5" (rough opening, with usable interior height of 3-1/2") is excessive given that most top drawers hold things like utensils and knives.