At TradeStation, you can trade on the largest US stock markets, such as the NYSE or NASDAQ. You cannot trade on non-US stock exchanges.
You can acquire ETFs traded on US exchanges even if you are a European client. This is a unique opportunity that most European brokers do not provide.

TradeStation only allows you to trade bonds over the phone; they’re not available on any of the online platforms.

TradeStation’s fund coverage is mid-range. However, it does include the biggest names, like BlackRock or Vanguard.

TradeStation gives you access to the largest US futures markets, such as CBOT or ICEUS.
Weighed against its competitors, TradeStation has a broader selection of futures than tastyworks, but ranks behind Interactive Brokers, which covers markets all over the world.

The number of options available at Saxo is high. You can trade on major stock exchanges such as a CBOE or Euronext, but you will also find lesser-known ones such as the SEHK.
You can trade options on stock, forex and contract.