Having only tried the Logitech, I have to say...welll...urm...Logitech.
I've heard awesome stuff from the Fanatec but I sort of dislike the way it looks (Not that I don't like a Porsche wheel, but I do have something against a Porsche wheel when I'm not driving a Porsche car) and I've heard pretty worrying things from their waiting lists, customer service, and shipment arrangements (at least when shipping to where I live, I see you're South American as well so it could be a trouble for you too).
I've also heard a lot of good stuff from the T500RS but the price tag just absoulutely kills it. Twice. With fire. US$600 is waaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaay too much. It's what I paid for my G27 and PS3. And my G27 has a decent enough shifter, shifting paddles that stay on their place, a clutch pedal I can actually use, some leather thrown in here and there, and the LED shifting lights. Though the leather and lights are actually gimmicks, the leather feels fine and looks awesome and the lights are something cool to show to your mates.
The G27 is, by my books, the best wheel to get. Yeah, it might still not have full on support (Damned PD!) but it looks and feels sturdy, has a """decent""" price tag, and is retailed by a lot of shops all over the world. It's great, "affordable", and you don't have to pay for mind-boggling shipping arrangements to get it. I actually bought it from Amazon in the U.S and a friend of mom who works there and travels usually brought it here, so shipment was actually free. It might not be as good as the other two (Which isn't saying it is bad. Actually, it's an excellent wheel. The other two are indeed better, but you can't go wrong with any of them) in specs, but in the real world, with a real wallet and real shipping companies, I'd say G27.
Just my opinion, amigo argentino 👍.