technotux

Obviously DDNS stream is better than the cloud/p2p as you are directly connected to your CAM/DVR in case of DDNS but quality of stream depends on the bandwidth you are having at the DVR side, in case of p2p/cloud it automatically optimizes stream according to your internet connection, but you will have to face latency this case.

It is actually depend on which USB dongle you use, if you can provide USB dongle model no. which you are planning to use accordingly modem can be suggested