vaccine for rabies - Rabipur or Merieux ?

I am from Australia and am travelling to Mexico and Central America for a tour
and then for some volunteering with animals (for 6 and a half weeks) I want to
have the three vaccinations for Rabies as I will be working with animals at any
chance that I get. My GP gave me a script to get the three injections with
rabipur and I visited a travel doctor and he gave me a script for the three
injections with Merieux. The Rabipur will be $98 for each three shots ($294
total) but the Merieux would be $130 for each shot ($390 total). I of course
want to save money, but if Merieux is a better vaccination then I would be happy
to have this vaccination. Which vaccination would you recommend? Is one
particularly better than the other? I'm not allergic to anything that I'm aware
of. Which vaccine is recommended? Thanks, Krista (Australia).