Credit Card for high spenders - United Club vs. Chase Sapphire Preferred

With the United cards emphasizing CC spends, what's the math for United Club vs. Chase Sapphire? With over $350k in annual spending, the increased points needed for 1k aren't an issue, but in terms of value is there a way to see which CC is more useful? Or perhaps hit 1k at United then switch spending to Chase Sapphire?