Concur.
And as a guy with both a home-built pan-based Suby conversion (albeit in swoop-fendered, upright grill MG guise) and a pro-built air-cooled engine in a home-built, tube-framed Spyder replica, I will add that, although the Suby is more reliable on a per-start basis, it has required some serious work since its installation.
It also makes the car less old-timey in a way I hadn't reckoned. The engine's torque means shifting gears is optional, where it used to be necessarily strategic. In some ways, that makes the MG ever so slightly less fun—even though it's much faster and more capable than it was with the old 1600 stock Bug mill. 
The Spyder's air-cooled engine, a pro-built 1915 Type 1, fixed with a proper programmable ignition system, is occasionally finicky. It does drip a spot of oil. Hot starts can be a process.
My two cars are comparable to each other in several ways. Both run with the same gear ratios: 3.44 R&P and stock Bug gears, .93 4th. So they both cruise at just under 70 mph at 3,000 RPM.
Both engines peak around 5500 RPM. The Type 1 is rated at 120 hp and loses about 2 horses at 6k. The EJ22 makes a claimed 137 hp and has a stock, unalterable rev limiter at 6k.
Both engines provide their respective cars (with me and fuel aboard) almost the same power to weight ratio: 14.3 lb/hp in the MG; 14.25 lb/hp in the Spyder
So which is better?
For me, the Suby is better in the MG (it fits better than a dual-carb VW engine ever could; the radiator grill was already there), and the Type 1 is better in the lighter, originally air-cooled 550.
But that's me, and that's this Suby and this 1915 Type 1.
Your mileage will probably vary.