[theory6]

Just to answer your question, in my opinion the hardest regional out of the two we've been to is probably the Canadian Regional. Why? Well it's got a lot of participants and I'd say that EVERY team is highly competitive hence making the regional itself very "interesting".

But like mentioned above it all depends on certain teams, or nationals. I'd rather not predict the future of something that has a high rate of uncertainty (ex: rookie's and innovative methods).