Zowie FK1 specifications:
USB: 2.0/3.0 Plug & Play
Buttons: 5 buttons
Cable length: 2m/6.6ft
LOD (Lift-off distance): 1.5-1.8mm
Polling rate: 125/500/1000hz
Razer DeathAdder Chroma specifications:
Design: Ergonomic right-handed design with textured rubber side grips
DPI: 10,000dpi optical sensor
Lighting/Customization: Chroma lighting with 16.8 million customizable color options
Compatible Software: Razer Synapse enabled
Programmability: Five independently programmable Hyperesponse buttons
Polling: 1000Hz Ultrapolling (Not sure what the different between regular polling and "ultrapolling" is, if there is one.)
Additional: On-the-fly sensitivity adjustment
Additional: Always-on mode
Acceleration: Up to 300 inches per second*/50g acceleration (*tested on Razer Goliathus Control Edition - Soft Gaming Mouse Mat)
Additional: Gold-plated USB connector
Cable: Seven-foot, lightweight, braided fiber cable
Approximate size specifications: 127mm/5" (Length) x 70mm/2.76" (Width) x 44mm/1.73" (Height)
Approximate weight: 105g/0.23lbs
System requirements to Razer DeathAdder Chroma:
PC or Mac with a free USB port
Windows 10/Windows 8/Windows 7/Mac OS X (v10.8-10.11)
There are a few things that I am unsure of myself in regards to the Razer. First, why does the Razer DeathAdder Chroma advertise mouse acceleration? Isn't this something that gamers would dislike? Furthermore, I am not exactly sure what "ultrapolling" means other than the fact that the mouse has an "ultra" high polling rate. It does not mention variability in the polling rates. The Razer does, however, indicate a 10,000dpi optical sensor, which means that it could potentially have a DPI range up to 10,000. Moreover, I'm not sure what "Always-on" mode is.
The Zowie FK1 does specify a variability in the DPI (400, 800, 1600, 3200) and the polling rate (125, 500, 1000Hz). From what I understand, gaming mouses generally tend to have a LOD of under 1.5. However the Zowie FK1 indicates that it could be potentially up to 1.8. This is important because if you are moving your mouse across the mousepad at a high velocity, especially in competitive games, it could potentially lift off of the mousepad at a height greater than the LOD (lift-off distance) and therefore stop tracking.
Aside from the fact that many people also recommend the Zowie FK1, it also utilizes the Avago 3310 sensor, which is highly rated, whilst the the Chroma comes with the Avago ADNS s3988 sensor, which is also very highly rated. The Avago ADNS s3988 of the DeathAdder Chroma is superior performance-wise. However, I would have to recommend the Zowie FK1. Many people complain that the ergonomics of the DeathAdder Chroma is not comfortable and that, realistically, you will not notice a significant difference between the Avago 3310 and the Avago ADNS s3988 sensors.
This is a chart comparing the ADNS-3988 sensor (Avago ADNS s3988, DeathAdder Chroma) and the PMW3310DH (Avago 3310, Zowie FK1). It essentially reaffirms what I stated above.