Analog CCTV vs High Definition Camera
High Definition digital images are sharper and clearer than analog surveillance cameras. Analog Cameras are limited to 960h resolution which is 960x480 pixels. High Definition cameras can transmit upto 1080p resolution (3 MP) which is 1920x 1080 pixels. High definition cameras give up to 400% greater resolution than the analog cctv camera.
Now a days the price of High definition camera is same as that of analog camera. You definitely gets more resolution for the dollar with HD Technology.
Wired vs Wireless Cameras
Well this is the question now a days everyone is asking when it comes to installation issues. Wireless cameras require a sight with no obstacles, which is first issue, secondly wireless security is other main concern; anyone can get a cheap wireless receiver, and monitor everything your wireless camera is broadcasting to the DVR.
Wired cameras need coaxial cable run from camera to dvr location, but offers much better video quality, and longer lifespan as compared to wireless. If you are looking for reliability, security, and video quality go for wired installation.
Also called spy cameras, the highest form of surveillance, market is flooded with innovation like hidden lens in Smoke detectors, Motion detectors, clocks, mail boxes,etc. Especially when want to catch a smart thief, or dishonest employee, to watching the baby sitter, or pet sitter, hidden cameras are great tool that brings desired results and peace of mind.
It should be noted that hidden cameras doesn't have infrared and are not weather proof. Its quality reduces significantly in low light conditions. Despite that it has many advantages for law enforcement, assisted living, homes.