Custom editorial illustration; not an exact retail product.
When two dresses both look promising, another round of general opinions can make the decision harder. Compare the same details for each dress, then give the most important ones more weight. This is a way to clarify your choice, not a formula for finding a universally perfect outfit.
Name your three priorities first
Before reviewing photographs, write the three things that matter most to you. They might be comfortable seated wear, a particular neckline, staying within your total budget or being able to dress independently. Choose your own priorities rather than copying someone else's list.
Separate requirements from preferences. A dress that cannot be ready for the event has a different problem from one whose color you like slightly less. Keep that distinction visible while comparing the finalists.
Use the same try-on conditions
Where possible, compare the dresses with the shoes and undergarments you intend to wear. Give each the same basic check: stand, sit, walk and reach comfortably. Note any adjustment you repeatedly make and ask whether a proposed alteration can actually address it.
If one dress is only available in an unsuitable sample size, record that uncertainty instead of treating the sample as proof of the final fit. Ask the retailer what information they can provide about the ordered size and what happens if it does not work as expected.
Write down the complete known cost
For each option, list the dress price, quoted alterations and any genuinely necessary additions. Mark unknown amounts as unknown. An accessory you already own belongs in the plan just as much as a new purchase.
Confirm the order or purchase terms directly with the seller. Include the expected readiness date and any conditions affecting changes or returns. Do not let a lower starting price hide costs or timing questions that still need an answer.
Compare the feeling without giving it a score
Look at photographs if they help, but return to your notes about wearing each dress. You can appreciate a striking photograph while preferring the outfit that lets you relax in person.
Ask yourself what you would change about each finalist. If one option requires a long chain of hoped-for alterations and accessories before you can enjoy it, consider whether the other already meets more of your priorities. Discuss feasibility with the relevant professional rather than assuming every change is possible.
Use a simple sheet with two columns and five rows: priorities met, movement, dressing, total known cost and unresolved questions. Resolve the important unknowns, then allow yourself to choose. A considered decision does not require everyone around you to have the same favorite.