I've been to both quite a few times. Victoria show didn't do much for me. I make the trip to Van Show every year and spend the weekend, lots of deals, lots to see and lots to spend. I've stopped going to the Vic Show the last three years. I found I was paying just to walk through and quench my curiousity...Van Show, 6 to 8 hours viewing and buying. Vic Show a hour, maybe two max. I found it to be no where on the same scale. Be a good excuse to check out if you didn't happen to get to the big show I guess!
Cheers,
DaFixer