The best replacement for tcpdump is wireshark.

The best alternatives to tcpdump are rated as following:
★★★★★  wireshark
★★★  snoop
★★★  dumpcap
★★  tcpflow
★★  ethereal
★★  ngrep
★★  netcat
★★  snort
★  netstat
★  iptrace
★  tshark
★  windump
★  tethereal
  fw monitor
  kismet

Your alternative for tcpdump is not listed? Suggest!
Speaking about tcpdump, one probably shouldn't forget about payload.

Other search terms related to tcpdump and their ratings are:
★★★★★ payload
★★★★★ mac address
★★★ wireshark
★ pcap
You have in mind a companion for tcpdump and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of tcpdump in all years. Click on graph for more.
tcpdump
wireshark
snoop