80,000 Membership Rewards after $8,000 in six months. The highest dollar-value welcome offer in this comparison — MR transfer to 21 partners at 1.5–2¢+ per point. Real-world redemption value: roughly $1,200–1,600 depending on transfer routes.
The catch: $8,000 in six months is high. Bridging that requires $1,333/month in qualifying spend — manageable if you're routing rent through Plastiq or floating an upcoming expense, harder otherwise. Don't hit the spend through purchases you wouldn't otherwise make — that erodes the bonus value. Once-per-lifetime per card flavor (consumer Platinum is its own family separate from Business Platinum).