Pre-Order (50% deposit). Pay 50% now to secure the product. Pre-orders are filled first when stock arrives.
Choose pre-order for priority allocation, ahead of reserve customers.
Reserve (no payment). Hold a place in line with no charge. A reserve is a waiting list, not a guarantee.
Choose reserve if you want the product but do not want to commit financially yet.
Summary. Pre-order = 50% deposit + priority. Reserve = no payment + no guarantee.