The only difference I can find is that this one folds flat for more convenient traveling. (The part the back of your phone rests against appears to have some type of hinge so that it will slide down and lay flush with the base). Seems ridiculous in my opinion as the previous wireless dock/charging stands little bevel for sitting the phone on appears as thin or thinner than the back of this new charger. The reviews I have read claim the charging speeds are identical but more complaints on this new model about charging errors. Also this new one does not include a charging cable but rather they expect you to use the charging cable that came with your Samsung phone to plug into the "type C" USB port and then into the wall or computer.
One reviewer on Samsung's website claims "It comes with a fast charge usb-c brick and a usb-c to usb-c cable to feed it power" but I cannot find anything to support that claim.
Overall I see no reason to opt for this over the previous less expensive model.