Need Help Deciding on New Business Credit Card

Business owner here trying to optimize my long-term travel/points setup instead of chasing flashy perks.

Married with kids. I already have the Chase Sapphire Reserve, several Chase Ink Business Cards, and a United Business Card that I barely use.

I’ll be flying almost every other weekend for the next few years, mostly Atlanta ↔ Chicago and Atlanta ↔ Dallas.

I don’t really care about lounge access — I mainly want:
– best bang for my buck
– flexible/reliable flights
– strong long-term point value
– good family/domestic travel redemptions

Debating between:
– The Platinum Card from American Express
– Delta SkyMiles Reserve Business American Express Card
– Southwest Rapid Rewards Performance Business Credit Card

What would you do in my situation and why?