In managing currency risk for my export business, I'm trying to decide between forward contracts and futures. What are the key differences in terms of flexibility, cost, and settlement for transactions with both fixed and variable delivery dates?

I run a small export business that ships goods to multiple countries, and I've been using forward contracts for predictable orders. However, I'm exploring futures for more flexibility with irregular shipments. I've researched both, but I'm struggling with the practical implications, especially regarding margin requirements and how they handle changes in delivery schedules. Any insights would be really helpful!