Both programs are similar in my experience . LHW has Vita agents. Virtuoso has Virtuoso agents.
Virtuoso benefits are similar to Vita LHW benefits.
in the end, my travel agent is a Vita agent and a Virtuoso agent. I either book direct on the LHW website or with the travel agent, Virtuoso or LHW .whatever gives me the best value.
I have better upgrade experience with LHW compared to Virtuoso, both upon booking and on arrival. Made 5 LHW bookings the last weeks and 3 of them were upgraded upon booking while few of my Virtuoso bookings ever did get upgraded upon booking.