LogFAQs > #953601874

I like these comments about them being very similiar.

Acura, Lexus, Infiniti, are literally just rebadges of Honda, Toyota, Nissan mostly for the US market.
If you look at some you'll notice this through history. Honda NSX was/is sold under Acura NSX, same for the Integra. Toyota Soarer is the Lexus SC###, Toyota Aristo are GS, etc.

The reason they're a "fancier" brand is because of past wariness. It's literally the same car, but Americans feel uncomfortable with buying a Toyota for a high price, because it's a cheap Japanese brand. It sounds dumb, but it totally works...
In Japan and some other markets they're still the original name/model. Things like the Nissan numbers and letters thing also stemmed from this, the Fairlady became 240Z, cuz it "sounds cool"

There was also the Volkswagen Phaeton that competed with and sometimes surpassed the 100k usd offerings from Mercedes and others, but people literally don't know what it is because it looks like a VW Jetta.

As for which to get... I prefer Lexus or Acura over Infiniti. As much as I like my Renaults, they've dragged Nissan/Infiniti into their "lets suck now" crew with Mitsubishi.