Kraken is probably the worst among all the exchanges that you mentioned, did you even used these exchanges long enough to be able to give them a fair rating?

Kraken has a great history of creating its own wicks(up or down) to maybe liquidate some positions whenever they want to, and it's probably one of the shadiest exchanges that supports leveraged trading.

Best exchanges that support futures and leverage trading are Binance, Kucoin and maybe Okex and I would not trust any other exchange specially when it comes to leveraged trading knowing how easy it is to manipulate positions in a way that has the most profit for them.