Fidelity Investments vs Interactive Brokers — which broker is better?

Pros

• USD 0 online US stock and ETF commissions, and Fidelity does not accept payment for order flow on equity orders
• Zero-expense-ratio index mutual funds (the FZROX family) — no other major US broker matches this on fund cost
• Options exercise and assignment cost USD 0, and buy-to-close orders at USD 0.65 or less are free
• No outgoing account transfer fee, no domestic wire fee and no inactivity or maintenance fee
• Idle cash defaults into the SPAXX money market fund rather than a near-zero bank sweep, so uninvested balances earn a market-linked yield without manual intervention
• International trading in 25 markets with settlement in 16 currencies, at GBP 9 for the UK and EUR 19 for euro-zone markets
• Best-in-class research: roughly seven third-party report providers plus the proprietary Equity Summary Score, and consistently rated first for research and education
• Fractional share investing from USD 1 across a broad US universe, not just large-cap index constituents

Cons

• No futures, no futures options and no retail forex — a hard stop for macro and commodity traders
• No paper trading or simulator, so there is no way to rehearse a strategy inside the platform
• Crypto is limited to Bitcoin, Ethereum and Litecoin with a spread of up to 1% built into the price, and is not SIPC-protected
• New accounts are effectively US residents only; Fidelity states it does not open accounts for customers residing outside the United States and restricts existing accounts when clients move abroad
• Charting and drawing tools in Trader+ are weaker than thinkorswim's, and there is no backtesting engine
• The FX markup on international trades settled in USD starts at a full 100 basis points below USD 100,000 — expensive for small foreign orders

Pros

• US stocks from USD 0.0035 per share on the Tiered plan, minimum USD 0.35 per order and capped at 1% of trade value
• Currency conversion at 0.20 basis points (minimum USD 2) — an order of magnitude cheaper than most European brokers' 0.25%–1.5%
• Roughly 160 market destinations in 36 countries from a single multi-currency account, with 28 settlement currencies
• No inactivity fee since 2021, plus no custody fee and no platform fee
• Trader Workstation offers over 100 order types plus a mature Python/Java/REST API used widely by retail algo traders
• Nasdaq-listed parent (IBKR) with published quarterly financials and around USD 21 billion of equity capital
• Top-tier licences in the US, UK, Ireland, Australia, Singapore and Hong Kong, with per-entity investor compensation disclosed
• Paper trading account mirrors the live platform, including the full API

Cons

• Customer support is the most common complaint: many requests go through the ticket system, and public reviews (e.g. on Trustpilot) often cite slow replies and template answers
• Trader Workstation has a genuinely steep learning curve; the first session is intimidating even for experienced traders
• The fee schedule is complicated: Fixed versus Tiered, pass-through exchange fees, and per-exchange minimums make cost prediction harder than it should be
• Real-time market data is a paid subscription per exchange, so the headline commissions understate the true monthly cost for active traders
• Account opening is longer and more document-heavy than at app-first brokers, and the website navigation is poor
• Spot crypto is only available to US clients via a separate arrangement; EEA clients get futures and exchange-traded products instead