How do you feel about GT in comparison to Forza? I personally found Forza a lot more approachable.
Forza 4 and 5 feel more "complete" and more polished than GT 5 and 6.
Obviously Forza 4 and 5 have better graphics and much MUCH better sound like GT5/6. They also offer more customization such as the ability to design, download, and use custom liveries.
But IMO, GT 6 still has the best driving physics out of them. Forza's driving and tire physics is a lot less forgiving than Gran Turismo's, which is a bit more realistic, but when it comes to a car's physics, like weight-transfer and suspension, you really can't beat GT 6.
Forza 5 has the best graphics since it's an Xbox One game, but because the in-game tracks are made, you're not allowed to change track settings like time and weather. Also, surprisingly, things actually look more realistic in GT 6 despite the pathetic PS3 graphics.
These games are best played on a racing wheel and a good wheel isn't cheap. So for casual racing gamers, I still recommend GRID Autosport for the best and most authentic racing experience.
I think part of it for me is that I'm less interested in race tracks. Of course the principles are sound, but there's something about racing on a street that makes it feel more...real or practical to me.
I actually disagree. Most street racing games feel fake and pretentious to me. Especially Need For Speed. There are a few games that replicate street racing more accurately like Test Drive Unlimited 2 and maybe Forza Horizon 2. We'll soon find out.
If you attend a driving school or track your cars in real life, racing sims are actually more practical to you. Since you can practice some of the maneuvers without worrying about crashing or killing yourself. It is also a lot cheaper than attending a track day event.
Trust me, even amateur racing like autocross is extremely expensive. I just spent $1200 replacing the rear tires on my GT2. With oil, brake pads, and clutch, it can get scary expensive fast. I don't do any street racing because it is too dangerous, I already attract cops' attention sitting at a red light, and I don't need to prove anything when I'm in a 600+ hp car.