@Wi**
if you are getting it through the public programme they typically offer you a vaccine and you don't get to choose which one. I think the current options are AZ+AZ, AZ+Pfizer or Pfizer+Pfizer. They were doing Sinovac+AZ but announced a month ago they were stopping Sinovac when supplies ran out.
There was a specific expat vaccination programme spurred by a US government donation that was Pfizer+Pfizer, if you get on this you should get Pfizer. That's what I got.
If you buy one of the Moderna spots privately, you'll get Moderna. It could be a wait until you get it, but this depends, you might get it soon. A lot of people bought a Moderna spot back earlier in the year but then got Pfizer in the mean time and so there are a lot selling them, typically at cost (around 1,650/shot IIRC).