Aerolineas sells over priced tickets. Air hostesses are quite hostile.
Expensive and hostile soft product is exactly how I'd describe AeroCampora. I fly them domestically when if they're significantly cheaper only, and internationally they're often the most expensive. They're good for collecting Delta SkyMiles and not much else.
I've been lucky enough to fly 170+ times (according to the spreadsheet I keep) and of the carriers that service AEP or EZE I can comment on the following:
Aerolíneas Argentinas: See above
Air Canada: Hard product is okay, generally needlessly expensive, awful soft product (from Canadians, intl. crew is fine) only redeeming perk is Aeroplan which lets you earn with United/Star Alliance and their new family share which merges accounts across multiple people which is great
American Airlines: Only ever flew US Airways once domestically, it was fine
Copa: I like Copa (except for the restrooms on the 737 Max) because I get 100% Aeroplan earning, good meal/drinks, quick connection in PTY, and the crew is usually friendly. The downside is the old PTY terminal which is basically tropical LaGuardia (in terms of humidity, prices, and general ugliness) plus 30 mins max of free WiFi so if you're early or late use it wisely
Delta: I really like Delta for transcontinental, it's a shame they're usually the most expensive. Good hard and soft product, friendly staff in air and on the ground, and they just work from my experiences
Ethiopian Airlines: Food was good, hard product was rough, especially for a 787, looked decades old, but roomier compared to most carriers. Staff seemed tired/under a lot of demand/stress
Flybondi: Better than Aerolineas, used them to fly GRU-EZE and was great, very similar to Vueling, no frills but the price and product is worth it
ITA Airways: Flew them as Alitalia, no real issues, nothing stood out, good or bad
JetSmart: They were fine, discount airline, similar to Flybondi, no complaints
LATAM: I've flown all 3 (TAM, LAN, and LATAM) and the experience has been the same: rather basic for the price you pay, and they nickel dime over carry-ons now which is annoying seeing as they're rarely cheap. FA smashed the shit out of a box of alfajores I bought for my mom, only response was "oh, sorry"
Lufthansa: German efficiency in an uninspiring product - nothing to brag or complain about, it just works
Turkish: Probably amongst the better experiences I've had, soft and hard was good, food was good even if not enough for the long IST-GRU leg, and the seats are more spacious than most carriers
United: See my previous review; default usually for long haul international for the price/time/points combo, only one major issue which they handled very well