Start with a problem statement
An upgrade list can make every option sound desirable. Before choosing, describe the problem you are trying to solve in plain language. Are you unable to reach a location, losing an important resource, or spending too many actions on a repeated task? The more specific the problem, the easier it is to see whether an upgrade description actually addresses it.
In a fictional defense challenge, suppose a route remains uncovered while another route already receives attention. An option that adds more effect to the covered route might be less relevant than one that explicitly extends coverage. This is a comparison method, not a recommendation for a named game. Its usefulness depends on what the actual upgrades and rules say.
Read the condition attached to the benefit
Upgrade descriptions sometimes contain limits: a benefit applies only to a certain action, region or resource. Those conditions matter as much as the attractive word at the beginning. An increase to one kind of capacity does not imply an increase to every kind. Keep the scope of the benefit intact when translating the description into your own plan.
Also look for costs beyond the purchase price. An upgrade could occupy a slot, replace another choice or require a later resource if the game states those rules. Do not infer hidden penalties, but do include documented commitments. A cheaper option can be difficult to justify if it prevents the exact capability you expect to need next.
Choose a reason you can evaluate later
Phrase the decision as a prediction about the problem: I am choosing this because its stated coverage should address the unserved route. After playing, inspect that relationship. If the route remains uncovered, you have a reason to revisit the interpretation or placement. A vague goal such as become stronger gives you much less to evaluate.
Sometimes the available descriptions are too incomplete to support a confident comparison. You can then choose based on the clearest documented use, postpone the decision where allowed, or try one option with uncertainty recorded. What you should avoid is inventing a numerical ranking that the game has not supplied. A sensible comparison can remain qualitative and still be specific about the problem it is intended to solve.