That is a real choice when both spouses hold shares. Either spouse may be the petitioning investor, with the other and unmarried children under 21 seeking derivative status. The decision affects whose source-of-funds evidence is examined and whose immigration history is reviewed, so make it before filing rather than after.
Pick the petitioner deliberately
Compare each spouse's documentary position: length of ownership, tax filings in their own name, and any past visa refusals or overstays that would need explaining. Marital property rules in the home country may make the shares jointly owned regardless of the register, which is a question for counsel. Children's ages matter too — protection against ageing out is fact-specific, not automatic — so record every birthdate at the outset and ask how the timeline affects each child.
Add one further consideration to that comparison of spouses. The choice of petitioner is not only a documentary question; it also determines whose immigration history is examined most closely and whose future flexibility is most constrained, since the principal carries obligations through conditional residence and the removal-of-conditions stage that a derivative does not carry in the same way. Weigh both aspects together rather than choosing on paperwork alone.
Hypothetical example: a couple who jointly owned a container leasing business find that one spouse's documentary position is marginally cleaner while the other's professional commitments abroad would sit awkwardly with the obligations a principal carries, and putting both considerations on the same page produces a different answer from either taken alone.