Ok from a non Ozzie - Australian Ford or Australian Holden (GM) = still a taxi not matter which side you of the fence you are on.
Now if we are talking Ford vs GM then that is a different ball game as a lot of different countries and marques come into play. But if looking at just the GOD DAMN land then I would be Ford for a few reasons (which I might keep to my self or not)
For the FORD are cars like pre 70 Mustangs, T-Birds, Coupes, Shelby Mustangs. Then the US and UK + Others working together to create cars like the GT-40, AC Cobra's and Cobra Daytona's
For GM.....I do find it hard...50's vettes, and the original split window vette, the first stingray....the 350 V8 engine and the aftermarkets support for these....and that is about it from me.
So that is my take on it - if it is Ozzie = good company car or taxi so who in the right mind would pay over $100K for a taxi? I just don't get it yes they might be a special model and the like but come on I would not sink all my hard earned $$ into a (when new) HSV GTS-R aka a 2 door taxi with a few HSV bits and a large Chev engine.
Purchase something with racing heritage/history yes, a off the shelf car produced in large numbers (ie over a few 1000) with no history for over $100K no.
Now NZ has no local car manufacturing anymore and I can say when this went away along with the import tariffs Euro cars are still no cheaper and in fact we have limited selection with only the base models here and usually at might higher prices after you work out the $$, Taxes and shipping cost would be better to import your self but then you have other red tape and issues if a new car and a model not sold in NZ or AU ie does it conform to the safety standards etc. So in part it is good to have a local car manufacturing industry as there will be a larger number of smaller business that also support these, exhaust shops, brakes (just look at PBR and were they have come from and what the have purchased and invented over the years..good on you Ozzies for that one

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When the car manufacturing was shut down here in NZ (no NZ brands just Toyota, Mazda, Ford, Nissan etc assembly plants) lots of supporting industries went away or off shore ie seat makers, glass manufactures, exhaust manufactures and warehouses, tyre companies cut production and I think there is now only one left. So if you can keep them you should as it will put a lot of people out of work = on the dole = you will pay for it with more taxes etc maybe you get a better car that is imported (ie not the Ozzie Friday Afro special that come out of Ford and Holden, and the other locally assembled cars, from time to time when the boy's just want to get to the pub)