Vanguard and Fidelity are both reputable brokerages, so the better choice depends on what you’re investing in and how you want to invest, not the company itself.
Vanguard is known for low-cost index funds and ETFs (its own funds average very low expense ratios) and is investor-owned, which some see as aligning incentives with shareholders. Fidelity offers competitive or zero-expense-ratio index funds too, plus stronger customer service, a more polished trading platform, and better cash management features.
For a $300,000 portfolio, either can build a solid diversified mix of index funds at minimal cost. The bigger factors are your asset allocation, tax placement, and fees, not the brokerage name. I’m not a financial advisor, so consider consulting one for personalized guidance.
Related: Review of Fidelity’s Gold IRA