While a device like the Samsung Galaxy Note 3 is offered at a premium price with the manufacturers custom software and experience, we not have equal power in a much more affordable package in the Google Nexus 5. If you prefer the pure Android experience with quick updates to the latest software there is no better device right now than the LG built Nexus 5. However the digital pen optimized input on the Galaxy Note 3 maybe preferential for some users.
The Samsung Galaxy Note 3 features a 5.7 inch touch display, up to 64GB of internal storage which can be expanded through microSD, a 13 megapixel camera capable of 2160p HD video capture, a secondary 2 megapixel camera for video calls, a stylus for input and be powered by a Samsung Exynos 5 Octa core processor (1.9GHz quad-core A15 CPU and a 1.3GHz quad-core A7 CPU) with 3GB of RAM.
The Google Nexus 5 by LG features a 5 inch full 1080p HD display, 16GB and 32GB storage options, an 8 megapixel camera with optical image stabilization, a 1.3 megapixel front facing camera for video calls, 4G LTE connectivity, wireless charging with a 2300 mAh battery and a quad-core Qualcomm Snapdragon 800 chip with Adreno 320 graphics and 2GB of RAM.
You can read the full comparison between the Google Nexus 5 and the Samsung Galaxy Note 3 on PhoneArena.