The main difference between forex trading and crypto trading is that you trade different assets. Crypto trading implies trading cryptocurrency and only, while forex trading implies trading various assets in order to reach the goal - extract profits via buying an asset and then selling it at the higher price. In my opinion, forex trading is much easier than crypto trading because of it's stability in relation to cryptos. Cryptos are so volatile that it's kinda difficult to foresee the price movement, especially when you're a novice. So, if you can't decide which way of trading to choose, then start from forex.