So, let's take a look and weight the two contenders, their pros and cons.
On the one hand, we have Brock Lesnar who defeated two wrestling legends, in two walks, Steve Austin and John Cena.
On the other hand, there's HBK who earned to hard fought victories against two in ring-technicians, Bret Hart and Kurt Angle.
Obviously, Brock Lesnar has the upper hand as far as stamina is concerned. But that doesn't really matter against a guy who wrestled for 60+ minutes straight at the main event of WM12. A guy who would always put his life into the ring, to provide 5-star wrestling classics, no matter the opponnent and no matter how tired he was going to be. HBK is simply the man.
Lesnar is tough and could beat anyone in a straight up fist-fight. But he's not smart. He almost lost the belt at WM31 to Reigns because of one mistake he did, that got him busted open. He almost lost to Cena at NoC, because he underestimated him. He lost to Cena and HHH at Extreme Rules and WM29, for the same reason. He doesn't think, he just punches.
HBK is obviously the smartest guy to step in the ring. He could outthink any opponent.
Another trait HBK has is that he wrestles like a heel. He could win by count-out, DQ. He doesn't care as long as there's no championship involved. HBK isn't a guy that's going to give Brock a straight up fight, like Cena and Austin.
HBK outwrestles Brock any day of the week. That's a fact that can't be argued by anybody.
All these factors that I mentioned simply make HBK the favourite to win this one.
My only concern is HBK's record in a big match situation. He always brings everything out, but can't get the victory. Austin, Cena, HHH, Taker, Angle, Hogan, Orton. All these guys defeated HBK in a big match situation.
However, Shawn would always win the rematch. Why? Because he knew what his opponent was going to bring to the table. And since we're talking prime, which was during the 1996-1997, Shawn once again has the upper hand.
This is a tough one for me.
HBK gets the upper hand, Brock then kicks HBK's ass for the rest of the match, mistake, Sweet Chin Music, Brock counters, HBK kicks out, beats Brock Lesnar after a low blow that the ref does not see.
I vote for HBK for all the reasons stated and simply because I don't want Brock to win this tournament. Impressive showing by Lesnar, but simply, he's too dumb and can't win against a legend like HBK, not under these circumstances.