Below we list some of the difference between Shark NV70 and NV44, hope the info helps.
NV44 vs NV70
The steering feature might be something that many people would take into consideration.
The Shark Navigator Plus 2X Capacity NV44 is not equipped with the swivel technology. While the Shark Navigator DLX Upright Vacuum NV70 features the swivel steering that allows you to maneuver around obstacles more easily.
The NV44 has no HEPA filtration while the NV70 has a HEPA filter.
Dust Bin Capacity:
The NV70 has a larger dust cup which 3 times the capacity of the original Navigator while the dust cup capacity on the NV44 is twice that of the original Navigator.
The NV44 comes with a Crevice Tool, Dusting Brush, and Pet Hair Power Brush.
The NV70 comes with a short Crevice Tool which is 5.5″, a long Crevice Tool which is 16″, Dusting Brush, and Pet Power Brush.
The NV70 is more expensive.
The NV44 is lavender while the NV70 comes in gold.
Both of them have the same power specs: 120V, 1200 watts, 10 amps,60Hz.