Shape: reach against forgiveness
Standard shapes are wider and shorter, with a large, centrally placed sweet spot. They are the forgiving option and the right default for most players.
Elongated shapes trade width for length. You get reach and more leverage on a drive, and you pay for it with a narrower sweet spot that moves toward the tip. If you are missing the middle of the paddle often, an elongated shape will punish that.
Hybrid shapes sit between the two and are a reasonable choice when you are unsure. Nothing about shape is a skill signal. Plenty of strong players use standard shapes on purpose.
Weight: power against control and your elbow
Heavier paddles deliver more power for the same swing and absorb more of the ball's energy, which means less shock through the arm on off center hits. Lighter paddles are quicker at the net, where most points are decided.
The number to compare is not just the static weight but the swing weight, which describes how heavy it feels in motion. Two paddles of identical weight can swing completely differently depending on where that weight sits.
If you have any history of elbow or shoulder trouble, weight and vibration damping matter more than any other specification, and it is worth choosing around them rather than around power.
Core thickness: the single biggest feel decision
Thicker cores, typically around 16mm, are softer, more controlled and more forgiving. Thinner cores, around 13 or 14mm, are poppier and more powerful, with a smaller margin for error.
Most players who move from a thin core to a thick one describe the change as the paddle becoming quieter and more predictable. Most who go the other way describe more free power and more unforced errors. Neither is better; they are different tools.
If you are unsure, 16mm is the safer starting point and the more common choice at every level.
Face material: spin, and how long it lasts
Raw carbon faces grip the ball hardest and generate the most spin, and they are also the ones that wear smooth fastest. Composite and fiberglass faces are livelier off the face and hold their texture longer. Graphite sits between the two.
This matters more secondhand than it does new. A raw carbon paddle is largely bought for its bite, so a used one that has lost its texture is a different paddle from the one in the reviews. It is a control paddle now. That is not a defect, but it should be reflected in the price and it should be something you know before you buy.
Every listing here states the face material and carries a grade that accounts for texture wear, which is the specification hardest to judge from a photograph.