A Goku and Vegeta display works best when both characters remain visible and the direction of their poses makes sense together. Start with the relationship you want the shelf to suggest: a forward-facing lineup, an inward-facing encounter or two independent favorites.
Choose the composition before matching colors
For a lineup, look for faces that read clearly from the front. For an encounter, check whether the figures can face toward each other without a weapon, hand or effect covering the other character. For independent favorites, leave enough space that each composition can stand on its own.
A matched hair color or outfit theme can be appealing, but it is not essential. Two versions you genuinely like can make a better pair than two matching versions chosen only for uniformity.
Compare bodies rather than total height alone
One figure may sit on a much taller base. If both products are listed at the same height, the characters themselves can still look very different in size. Study body proportions and confirm any stated scale instead of assuming that equal centimeter measurements create a matched pair.
If the size difference is intentional, use it openly. Place one piece as the focal point and the other as a separate companion. Avoid forcing mismatched proportions into a tightly staged confrontation if the result feels awkward to you.
Plan the space between the poses
Draw the confirmed maximum footprints on paper. Mark the direction of each face and any outstretched parts. Arrange the paper first, checking depth as well as width. Turning a statue inward can increase the space it needs.
Keep bases fully supported and accessories from touching. The gap should also let you remove each piece without having to pass a fragile part through the neighboring figure's effects. Check shelf weight limits using the actual products and furniture guidance.
Test from your normal viewpoint
Look from your usual seat or standing position. Both faces should be visible, and the eye should move naturally between them. If one piece overwhelms the other, try more separation before adding a riser or another accessory.
Browse the Dragon Ball figure collection at Super Saiyan Sphere with a photo and dimensions of the figure you already own. Comparing against that real starting point is more useful than choosing a second piece in isolation.