While going from Palermo to Ezeiza, I usually hail the taxi with a whisk of my finger. And pay 1000 pesos flat rate including tolls.
While coming from Ezeiza to Palermo, I use Transfer express which is 1750 pesos.
I quit using remis from Palermo to Ezeiza as any times they arrive too early ( and try to make me start my journey earlier) or come too late. Also, they dont agree to my route preference as they do this whole day long and have their preferred route.
I don't use UBER from Palermo to Ezeiza as they often call me asking me where I am going, usually don;t know the routes and depend heavily on GPS. And because there are at least 4 different routes from Palermo to Ezeiza ( and if one is in a hurry), a experienced taxi driver makes a HUGE difference.
I dont use Taxi Ezeiza from Ezeiza as they have higher charges if paying via credit card. Transfer express is right after customs. Nice clean cars and mostly friendly experienced drivers. ( once in a while, I do meet some ass who insists on taking the worst route).
Recently, around 2 months ago, the Taxi mafia from Ezeiza has been eliminated. They used to bully and demand higher rates. Now the taxis stand in queue like any world airport. Will test it some day and report.
I am not a Argentina UBER fan ( I am a huge fan of UBER in USA or Brazil & a Grab fan in Asia). The UBER drivers here are really dumb asses. They insist that I sit in front. They like to pry on my phone. They get lost very easily, whie driving. When arriving at the airport, they fumble to retrieve the ticket from the ticket machine and seem to get lost when trying to choose between A and C terminal. Yes, if one is broke or poor, its the cheapest option.