To observe equal cost load balancing you could traceroute to the destination and should see the different router IPs in the output.
To observe unequal-cost load balancing you could issue debug ip packet, then ping the destination with a high repeat count (ping x.x.x.x repeat 50) and observe the output.
To clean things up, create an access-list to permit icmp echo
access-list 100 permit icmp any any echo
Then debug ip packet 100 , which refers to the access-list.
with traffic-share min across-interfaces command situation becomes identical to the forwarding behavior without use of the variance command. However, if you use the traffic-share min command and the variance command, even though traffic is sent over the minimum-cost path only, all feasible routes get installed into the routing table, which decreases convergence times.