As we have seen Both Sasuke and Madara evolved their Sharingan from MS > EMS > Rinnengan, thanks to that both Sasuke and Madara has access to both their Sharingan and Rinnengan powers. They are able to use MS jutsu along with Rinnengan jutsu.
Kaguya who gained Rinne-Sharingan can’t use MS jutsu, copy jutsu, genjutsu other than IT.
If a Sharingan is able to evolve into Rinne-Sharingan somehow then it will surpass Kaguya Rinne-Sharingan, due to being able to use Sharingan, MS, Rinnengan and Rinne-Sharingan powers.
Momoshinki has no access to MS jutsu at all.
Kaguya who gained Rinne-Sharingan can’t use MS jutsu, copy jutsu, genjutsu other than IT.
If a Sharingan is able to evolve into Rinne-Sharingan somehow then it will surpass Kaguya Rinne-Sharingan, due to being able to use Sharingan, MS, Rinnengan and Rinne-Sharingan powers.
Momoshinki has no access to MS jutsu at all.