McDonald's Corporation (MCD) is the better investment right now due to its lower beta of 0.414, indicating lower volatility compared to Starbucks (SBUX) at 0.977, which suggests more risk in turbulent markets. Furthermore, McDonald's brand strength and global footprint present a more stable growth trajectory in the fast-food sector compared to Starbucks' reliance on premium coffee and consumer discretionary spending. Although both companies lack P/E ratios and dividend yields in the provided data, MCD’s lower risk profile makes it a more attractive option for conservative investors.

Investors seeking stability and lower risk should favor McDonald's, while those willing to take on more risk for potentially higher rewards may consider Starbucks. For a balanced portfolio, MCD is the preferred choice.