I need to make a car rental booking around Christmas time. Almost everywhere is sold out except for 2-3 companies. Dollar has the best prices for our dates and mid/full size cars. The Destina and Dollar sites both quote the same rate but I want to know which I should book with. I want the extra AP miles so Destina wins there but haven't people here had problems with bookings on Destina.ca? The flights also have the same pricing (on AC). Is it a safe bet to book with Destina.ca so I can get the extra miles or should I just booke on the AC site and Dollar site?

Thanks