CLI command to see load balancing method for all Virtual Servers?

Load balancing method is a pool setting. You can check it with

 tmsh list ltm pool pool_name load-balancing-mode

You can run an small script for getting vs-pool relation and then get load balancing method

! /bin/bash 
output=$(tmsh list ltm virtual |grep "ltm virtual" | awk -F" " '{ print $3 }') 
for LINE in ${output}; do
  pool=$(tmsh list ltm virtual ${LINE} pool |grep pool |awk -F" " '{ print $2 }')
  if [ $pool != none ]
  then
     echo "Virtual: ${LINE}:"
     tmsh list ltm pool $pool load-balancing-mode
 fi
 done