I want to buy bitcoin with margin, but I am not sure which is the best way to do it considering commissions.
Practically there is 2 ways
To buy bitcoin futures or lending USDT and buying BTC
Which is the cheapest way to buy it?
Best of course, use a leverage. But if you do not have trading experience, I would first practice in your place to trade without margin. Since margin trading can incur big losses for you. I recommend the bitmex exchange.