The only perceivable difference is the €10k limit, hence my question whether this "simple" interface is just executing a spot order in the background, or if this is using different underlying mechanics (with different prices/fees). I must say, coming from Coinbase and Kraken, that Binance can be quite confusing.
I came to binance when it was just like other exchanges with altcoin trading. I think they've lost that simplicity in trying to add so many options and there are at least a couple of gui bugs that add easy to spot in places.
The €10k is probably to prevent any sort of major slippage in the market so a gap isn't produced (eg someone did a market sell of a few million $ on coinbase and crashed the price).. .