I think those comparing Murray to the next Simmons are off the mark. Sure they are both athletic, but their games and skill sets are very different.
Simmons isn't the type of creator Murray is. Simmons excels in the open the court off the ball on both ends. While Murray excels in the open and half court with the ball.
Murray is more natural as a lead guard or point guard and is much quicker with the ball and has been noticablely having a tighter handle than he did in the Summer League ( which is a very good sign). At the same time, he has a much quicker release on his shot. Whereas Simmons has a slow and low release that he can't get off half the time.
I'm very excited about Murray, being only 20 years old, he has elite size, length, quickness, speed and from the looks of it, he has an elite work ethic -- which is the most important thing. For a point guard, having all those strengths makes a damn exciting foundation that is very rare to find. The weaknesses, shooting & IQ, are very common for just about every 20 yr old who played in this league (they were common for Tony and Kobe) -- which will get better with time and maybe not a lot of time as his shooting stroke looks much better than it did just a year ago in WU.
I think he'll be a more effective player than Simmons in just a year, just because he's a natural point guard and has strengths that give him such a huge edge at the position on both ends because of his size, speed and length. The only strength Simmons has at his position is athletic ability -- his size/length doesn't give him an edge like it does Murray.