As the owner of a 2011 NA Evora, with a BOE CAI and Full 2bular Header-Downpipe-Metrallic Cat Exhaust System, AND a 2017 McLaren 570S I can address the OP’s questions directly.
My background is in Porsches, going back to my 1st car a 1956 Porsche Speedster I bought in 1965. I have raced Porsches in SCCA National since 1975, and Vintage Sports Racers since 1987.
When I drove one of the 2010 Evora Demo cars, I felt that it was the best handling street sports car that I had ever driven. I promptly ordered a new NA Evora, with the Promise that it could be upgraded to an S car with a Factory Lotus Kit, like the Eliges. That NEVER happened, so I upgraded my NA Evora. I sold 2 rare Porsches to purchase the Evora at MSRP, before the price was dropped, and dealers would deal on them.
In recent years, I have driven several new sports car marques, and never found any of them to handle like my Evora, until I drove a 570S. The 570 S handles just like an Evora, but with 562 HP, vs the 276 / 345 / 400 of the Evora’s, in a car of similar weight. Like the Evora, in the 570S you feel Connected to the car and road, getting the feedback that a race car typically gives you. The 570S has conventional Springs, Sway Bars, and Adjustable Shock Absorbers that give you this feedback, unlike the 650S and 675S models that have the Active Hydrolic Suspension, WITHOUT standard springs and sway bars. The 650S and 675S’s that I drove were very comfortable, quick, with terrific flat handling, but lacked that connection. I definitely preferred the 570S, regardless of price. My impressions are also reflected in the written and video reviews of the 570S. The 570S is NOT just a stop light racer car; it is best enjoyed on a twisty back country road, where its nimble superb handling comes to life, with the HP to rocket you out of the corners. I don’t track either my Evora or 570S, as I have my Bobsy-Porsche Sports Racer that I race every summer.
To answer some of the other questions / points made in this thread:
Yes, the 570S is an expensive car, and I am careful where I take it and park it, BUT no more so that I do with my Evora. As I told my wife, the money is not lost, and if I sell it, I will not take any more of a loss than I will on my Evora.
The visibility out of the 570S is MUCH better than the Evora, with higher windshield, side windows, and a MUCH larger rear window.
Ingress and egress are easier than the S1 Evora, and the cabin space is roomier in the 570S.
The 570S is very comfortable, and will make a great trip car as well as a back country canyon carver.
There is no back seat area or rear luggage space, but there is a front trunk for luggage.
Size wise, the 570S is 5.3” longer, 7.5” wider, 1.1” lower, and 3.7” longer wheel base, with a weight of 3,175 vs 3171 for the Evora 400.
Although I have always preferred a 3 pedal car, the 7 speed dual clutch is the 570S is seemless in anticipating the correct gear selection in any of the auto modes, or you can choose to paddle shift it yourself.
Bottom line, I like both my Evora and 570S. The 570S is definitely more powerful, and adds an element of speed and excitement above the Evora.
Is it more fun ? I’d have to say yes, if your definition of fun is spirited driving; or, even if you are just cruising, and enjoying it’s creature comforts.