Actually, the reservation I have is an outstanding rate compared to what I had booked previously. Literally, it's over $800 cheaper because Avis matched Alamo's drive-out deal for my (potential) one-way trip out of Florida.

By the way, your German company may or may not have a better deal. But, that deal is entirely irrelevant if your pick-up and/or drop-off locations don't have Sixt offices.