Seems to be a pretty reputable platform. Not sure why I never see anyone suggesting this platform anywhere,
Found you some answers, the platform isn't your average crypto trading brokers with just focus on cryptocurrencies and before
TradeStation catered solely to professional brokers and money managers.
so obviously you don't expect much suggestion coming from the community since majority are average traders without much experience in advance trading.
Tradestation are still new to the cryptocurrency industry too, they're not even upto a year old which is why their name isn't that common among the community members
TradeStation Crypto was launched in November 2019 and allows users to trade Bitcoin (BTC), Bitcoin Cash (BCH), Ethereum (ETH), Litecoin (LTC) and Ripple (XRP). TradeStation charges 1% per trade for accounts with balances of $100,000 or less, but through March 2020 the brokerage is offering crypto trades for a discounted 0.5% commission.
Responding to the OP question, the platforms looks decent too from my observation but that doesn't mean I'll recommend it over coinbase. I haven't used it neither have I used coinbase as there are better alternative to the two out there but since you're asking for a comparisons, go for coinbase as there reputable gives them the hedge