The 1- handed is the most versatile and dangerous stroke in tennis.
Sorry, but that's still wrong. Guys like Federer and Sampras who use that shot are moving their arm one foot to move the racket head one foot which is like lifting a stone with your arms rather than using a lever or arm punching in boxing. You can always tell the arm puncher in a prize fight, he's the guy being carried out in a wheelbarrow.
Your ignorance on this subject is quite annoying.
Go watch footage of Federer’s 1-handed return of serve or footage of when he takes the ball early. The racquet starts off low-mid thigh and ends shoulder height. No backswing required.
The only time you need to take a backswing is when you have plenty of time to set up. Even then, it is a restricted backhand.
Now, from my own personal experience (I have used both 2 and 1-handed extensively in USTA Junior’s and I was pretty darn good) the 2-handed limits creativity and is pretty darn predictable. It’s reach is also quite limited so it takes more energy to use a 2-handed because one must take 1+ more steps to reach a ball than a 1-handed.
A 1-handed, on the other hand, has great reach, very unpredictable (easy to conceal a slice or dropshot by making it look like your regular stroke) and can create angles that the 2 can’t hope to match.
There is more to the stroke than just how much you move the racquet head ya know.
The ONLY weakness (and it’s a big one) of the 1-hander is the high (above shoulder height) backhand shot. That sucker is HARD. Other than that, the 1-hander is better in every way. The 2-hander is easier to learn and requires less athletic ability to become consistent. That is why it is prevalent.
But what do I know? I’ve only played tennis for 20 years.