IP surveillance product problem

I am looking for a IP surveillance product, use it for home monitoring through internet from my office, I found that DVR is a good choice for me because it can connect multiple camaras at the same time, built-in web server, MPEG4/MJPEG compression, such as Planet DVR-460, I have some question on it as follow:

1) Why all this kind of products are using MJPEG for web transmittion?
2) What about the quailty of live view throught the Internet while using MJPEG?
3) Which one solution is better between IP-Cam and DVR + Camaras?

Thanks for help
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