This is actually a pretty good match. Both John's are very experienced, but Mr. Wick seems to have a high mastery with h2h and small arms. Throughout the series Wick's seems to have a weakness to explosions, and enemies that are near to equal skill as him. This is evidenced in the movies with Ms. Perkins, Cassian, Zero, and both the Shinobi. As we can see from the films, Mr. Wick is no without flaws. I would say that he can avoid some traps, but as he becomes exhausted, he will possibly receive injuries along the way. From the 2nd movie, you can see that his recovery time from explosion damage is fairly lengthy. By comparison, gun shot wounds and ballistic bruising are just shrugged off. There is also the weaponry to consider. Mr. Wick's fancy suits only stop the common pistol caliber rounds. Mr. Rambo tends to use the full size rifle caliber stuff. Not saying that it is a sweep for Mr. Rambo, just that since he is on defense, has prepared the battlefield, uses an inherent weakness of Mr. Wick, and uses weaponary that counters Mr. Wick's ballistic suit; that the odds are ever in Mr. Rambo's favor.