Let's consider each in turn. Two of the basics of kitchen cabinet design are quality issues. The other two are about style and taste.
The dimensions should be written down and the cabinet should be of the correct size.
Once you've narrowed it down to the cabinets that would match your kitchen and your budget, now it's just a matter of choosing the best ones. Don't over analyze during this process; just make a decision and commit to it. Wavering tends to lead to dissatisfaction with the final product.
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