Hulk is made by B&M, the Ferrari of coasters. RNR is made by Vekoma, the Kia of coasters.
The launches are pretty much the same but Hulk goes uphill and makes is easier to relax and lets you enjoy this part of the ride more. Hulk has a cobra roll that is very forceful and when it is running at its prime is extremely smooth. RNR has a sea serpent and at the inversion to half corkscrew your head gets clunked pretty good.
Hulk is a much smoother and longer coaster. The basic Hulk Coaster costs about twice as much as the basic RNR coaster (minus theming, station, Aerosmith, etc.) Hulk is superior coaster and if you enjoy RNR, Hulk will blow you away.
RNR stats
Length (feet): 3403'
Height (feet): 80'
Inversions: 3
Speed (mph): 57
Duration (m:ss): 1:22
G-Force (g): 5
200 ft Catapult (0-57 mph in 2.8 seconds). Elements: Cobra roll following the launch and a corkscrew.
Hulk Stats
Length (feet): 3700'
Height (feet): 110'
Drop (feet): 105'
Inversions: 7
Speed (mph): 67
Duration (m:ss): 2:15
G-Force (g): 4
Catapult launch up a 150 foot tunnel achieving 40mph in 2 seconds. Zero-G roll 110 feet above ground. Elements: Cobra roll, weightless roll, 360-degree carousel, two loops, inclined loop, high speed carousel and two flat spins