https://medicalresearch.com/author-interviews/no-difference-in-behavioral-issues-in-children-adopted-by-lgbt-parents/29168/
Children are developing well over time, with few behavior problems overall, regardless of whether they were adopted by lesbian mothers, gay fathers, or heterosexual parents. No differences among these family types.
In fact, the only difference is a child of gay parents cannot be baptized into the Mormon church. in my opinion, I'd say the children adopted by gay couples are plus one.