This article by TW's own professor pretty much says it all regarding "power": http://twu.tennis-warehouse.com/lear...csandspeed.php
Basically, if two racquets have the same swingweight...
...the stiffer one will produce a little faster shots when the ball rebounds off the strings near the tip and a tiny amount faster when rebounding left or right of center, but will not produce a significantly faster shot if struck in center of the strings.
...and one has an open string pattern and the other a closed string pattern, but the former has been strung a bit tighter so that both have equivalent stringbed stiffness, both will have the same power.
...ditto for a large headsize and small headsize
...but one is substantially lighter and/or more headlight than the other, then that racquet could be swung faster. Swingspeed is the most important thing to producing fast shots, so if this raquet can be swung faster it will be more powerful.
Racquets with high swingweight make it easier to change The direction of the ball.
Racquets with high swingweight are more stable at low swingspeeds, enhancing control on volleys and 1st serve returns.
Racquets with high swingweight pack more punch, so can be swung a little slower for the same result as a lighter frame. Most people find slower swings easier to control.
Racquets that have low swingweight and/or static weight can be swung a little faster, if the player is trying to swing all out. Faster swings generate more spin, granting control over depth and net clearance.
Racquets with a lot of weight in the handle are more stable, which seems to improve control on some shots, particularly volleys and OHBH. Weight in the handle also seems to improve feel on touch shots. In addition, weight in the handle gives some players more comtrol over their swing. These people find racquets that have light handles to feel too whippy and wild.
Racquets with open string patterns tend to generate more spin, giving the same benefits as mentioned above.
Racquets with closed string patterns make hitting flat with control easier.
Racquets with large headsizes give a player greater control in avoiding accidental mishits, especially when swinging fast to produce topspin. They also tend to twist less on off -center hits, and those hits therefore travel a little faster than they would with a smaller frame.
Racquets with small headsizes offer better directional accuracy, according to many players.
Racquets with smaller headsizes are regarded by some as offering better 'feel' for the ball, which improves a player's ability to control the ball.
Flexible racquets offer longer dwell time, helping some players generate spin and giving them more 'feel'. Others find flexible racquets difficult to control because the ball, staying on the strings longer, is pointing in a different direction when it leaves the strings than it was when it arrived at the strings.
With stiff racquets, the ball is pointing closer to its original direction as it leaves the strings because a stiff racquet 'carries' the ball for a shorter time and distance. Some people like this kind of control.
Rabbit's right though, a good player can play with anything and there are good players in the world right now playing with everything.