rtmpsuck allows you to stay undetected. It saves a stream while you watch it or listen to it.

Also some streaming servers do not allow you to reconnect, so this is where rtmpsuck can help.

The problem is that rtmpsuck allows to save one stream at a time only. Besides it records in real time.

So if you can record without rtmpsuck, then record without it unless you want to stay undetected.