The Razer Blade and the Razer Blade Stealth seem to be quite different in their intended usage. The regular model is slightly more expensive than its sibling, but it includes a quad-core (eight thread) Skylake processor and an NVIDIA GTX 1060. The Stealth model, on the other hand, uses a Kaby Lake (the successor to Skylake) dual-core (four thread) processor, and it uses the Intel HD Graphics 620 iGPU instead of adding a discrete part from AMD or NVIDIA.
The Stealth model weighs about 2.84 lbs, while the regular model is (relatively) much more heavy at 4.1 – 4.3 lbs, depending on the user's choice of screen. The extra weight is likely due in part to the much larger battery, which is needed to power the discrete GPU and last-generation quad-core CPU. Razer claims that the Stealth's 53.6 Wh battery will power the device for 9 hours. They do not seem to make any claims about how long the non-Stealth's 70Wh battery will last. Granted, that would depend on workload anyway.
This is where the interesting choice begins. Both devices are compatible with the Razer Core, which allows externally-attached desktop GPUs to be plugged into Razer laptops. If you look at their website design, the Razer Blade Stealth promotes the Core more prominently, even including a “Buy Now” button for it on the header. They also advertise 100% AdobeRGB color support on the Stealth, which is useful for graphics designers because it can be calibrated to either sRGB (web and video) or print (magazines) color spaces.
To me, the Stealth seems more for a user who wants to bring their laptop to work (or school) on a daily basis, and possibly plug it into a discrete GPU when they get home. Alternatively, the Razer Blade without a suffix is for someone who wants a strong, powerful PC that, while not as fast as a full desktop, is decently portable and even VR ready without external graphics. The higher resolution choices, despite the slower internal graphics, also suggests that the Stealth is more business, while the Blade is more gaming.
Before we go, Razer has also included a license of Fruity Loops Studio 12 Producer Edition. This is a popular piece of software that is used to create music by layering individual instruments and tracks. Even if you license Adobe Creative Cloud, this is one of the areas that, while Audition technically can overlap with, it's really not designed to. Instead, think GarageBand.
The Razer Blade Stealth is available now, from $999.99 (128GB QHD) to $1999.00 (1TB 4K).
The Razer Blade is also available now, from $1799.99 (256GB 1080p) to $2699.99 (1TB QHD+).