I don’t think Fëanor reminding Finwë of Míriel is the reason he’s Finwë's favorite child.
Míriel is the catalyst of course, since it was her absence that led to the codependency between her husband & their son
...but I still don't think Finwë's love for Fëanor was an extension of his love for her in the slightest.
Finwë's love for Míriel was honestly weak and proven to be very very conditional whereas his love for Fëanor was far stronger and fully unconditional by the end of his life.
Elrond loved Celebrían unconditionally, Eärendil loved Elwing unconditionally, Finwë did not love Míriel unconditionally.
He didn't love Míriel more that he loved the idea of having several kids, he didn't love her at her lowest when she was suffering and going through unimaginable pain & exhaustion.
The reason why Fëanor was Finwë's favorite is explicitly stated: Finwë raised Fëanor alone and had to be twice the parent to him, both a father and a mother, so he had twice the love for Fëanor and Fëanor had twice the love for him.
The reason is definitely not because Míriel was some great irreplaceable love, he certainly proved she was replaceable to him and even after her death he chose to disrespect her by calling her Serindë rather than honor her memory by calling her Þerindë like she had wanted.
If Míriel was his "favorite" wife and he treated her like that... it just goes to show how much of an idiot Indis was for thinking she would be important to Finwë when that man already proved how little the mother of his existing child meant to him. Or maybe she just didn't care as long as she could live out her fantasy.