I don't have any direct experience with those cameras, but I've listed some of the key differences I can see in each's spec below:
HiWatch - HWI-B120-D/W
- H.264/MJPEG compression only
- Cannot send alerts upon the loss of network connection
- Only available in a 2.8mm focal length option
- 50m WiFi range
HikVision - DS-2CD2021G1-IDW1 (please note that this actually does not have PoE)
This camera is almost identical to the one above, apart from:
- Will alert you on 'Video Tampering'
- BLC/3D DNR image enhancement only
- 50m WiFi range
- Wider web-browser compatibility
I should also point out that we don't often recommend the HiWatch range of camera and have never sold them, as explained in this post:
Hi all I realise that my registration on this forum "after" I bought a system is perhaps the wrong way around, but here I am anyway. I just bought this system: IP CCTV Systems On Sale | Get Free Ireland & UK Delivery I have a 5 year old CCTV system and I wanted to upgrade. We've had a few...