Choose the dress around the part of the celebration you actually need to dress for. For a birthday-style bridal dinner or an after-party, we would start with a shorter silhouette and build the outfit around the shoes. For a celebration where you want a long skirt in your photographs, start with the maxi, then check its hem and back detail against your plans. Neither choice needs to serve every event on the calendar.
This is an outfit-planning comparison for the person celebrating their own bridal events, rather than a recommendation for wedding guests. The styling suggestions below are editorial ideas, not wear-test results.
Two different starting points
The AVINO Pearl Satin Muse mini is described on its product page as a white mini dress with a satin-look finish. The Solenne Open-Back Tiered maxi is described with fine shoulder straps, a high-waist bodice, an open back with a tie, and a tiered maxi skirt.
For styling, we would treat the mini as a simpler base for one distinctive accessory: a sculptural earring, a small embellished bag, or an interesting shoe. With the maxi, we would let the tiers and back detail lead, then try a quieter bag and minimal jewelry. These are alternative directions, not a rule that one dress is more formal or flattering.
Plan the change before choosing a second dress
Write down where the outfit begins: a dinner, a reception, an after-party, or the next morning's brunch. Then note whether you have somewhere private to change and someone who can look after the first outfit. If changing would interrupt the part of the evening you most want to enjoy, keeping your original outfit is a reasonable choice.
Anthropologie's reception-dress guide discusses changing before dinner or a first dance. Use those as possible moments, not an obligation to buy another dress. Your schedule should decide whether a change is useful.
For example, imagine a seated dinner followed by a short walk to another venue. We would choose the shoes first, then try each dress with those shoes and the bag you intend to carry. For a celebration in one room, we would give more attention to sitting and moving in the outfit than to planning a change of location.
Give each silhouette its own fitting check
For the mini, sit in a chair similar to the one you expect to use, bend to pick up the bag, and check whether the coverage meets your preferences. Do not make the decision from a standing mirror view alone. If you would spend the evening adjusting the dress, choose another size or silhouette rather than planning to ignore the issue.
For the maxi, try the hem with the actual shoes and check it while walking and turning. Then try your intended underlayers with the open back. Decide whether you like the complete arrangement before choosing accessories to hide or work around it. Do not assume a particular undergarment will be invisible from product photographs.
For either dress, compare the available size information with your own measurements. A satin-look description describes an appearance; do not treat it as a promise of silk content, stretch, or opacity. Where the listing does not answer a material or measurement question that matters to you, resolve that question before ordering.
Finish one outfit, rather than two half-plans
Put the dress, shoes, bag, underlayers, and optional outer layer together in one place. Photograph the combination from the front and back for your own reference, then remove anything you are only adding because it feels as though a bridal outfit should include it.
Our suggested decision is simple: try the Pearl Satin Muse direction if you want a short silhouette with accessories as the focal point; try the Solenne direction if the long, tiered skirt and open-back detail are what you want to build around. Keep the option that works with your real schedule and fitting checks, including the option of wearing something you already own.