i thought a gas cooktop was the ultimate and i had and work with one, but i must say that induction is better!!!!!!!!!!!!!!!!!!!!!!!!!! however expensive. be aware that a gas range requires a vented range hood, else your home will feel and smell like burned gas. gas needs a range hood that vents the air out.
a ceramic smooth top, electric is fine, and in addition you can get a portable induction plate. split cooktops are also a dream: two burners electric, two induction, and one gas/wok or grill
as for ovens, what i like of self standing ranges, is that you can get a descent 36 inch wide or 42, specially useful if you are baking a lot for a large party, or a full baking sheet. for wall ovens, i would get the smallest as possible, because that means it is more even heat and will heat faster. i detest very large or wide wall ovens. i would get convection in all my ovens if possible. it is great for heating and for keeping temps more even (if you bake delicate items that don’t like air circulating, i turn the convection fan on and off).
you should consider countertop ovens too, there are a few out there that outperform wall or range ovens!