Talonflame and Marowak are both good, and seeing your team I would prefer Marowak.
The reason I choose Marowak
1. Talonflame has a type overlap with Dragonite.
2. Gale Wings isn't that good because it only activates when the user has full HP.
3. Rock Head Flare Blitz is so good in my opinion because you can spam it without worrying of the recoil damage and has a chance to burn the foe.
4. Alolan Marowak has 7 resistances and 2 immunities.
For this 4 reason, Alolan Marowak is more perfect for your team than Talonflame.
Hope I helped!