The difference in one sentence
A JOOLA gives you power you then have to control. A Selkirk gives you control you then have to generate power with. Almost everything else follows from that.
Neither is a beginner or an expert choice. Plenty of strong players are on Selkirks because they would rather place the ball than hit through it, and plenty of recreational players are on JOOLAs because they enjoy the pop. The question is which mistake you would rather make.
Feel at the ball
Selkirk's premium lines are quiet and soft, and the ball sits on the face a fraction longer. That is what people mean by a connected feel: you can tell what you did to the ball, which is exactly what matters on a reset or a drop.
JOOLA's flagships are stiffer and livelier. The ball leaves faster with less input, which is an advantage on a drive and a liability at the kitchen line until your hands catch up. If you have ever popped a reset up because the paddle did more than you asked, that is this difference.
What this means buying second-hand
Both brands are now largely thermoformed at the premium end, so both need the same check: tap slowly around the perimeter and listen for a change in pitch between sections of the edge. Internal separation is silent, invisible in photographs, and often feels like extra power before it feels like a fault.
The difference is where the wear shows. JOOLA's raw carbon faces lose grit noticeably, and a smooth one is a genuinely different paddle from the reviews — it has become a control paddle. Selkirk's edge guards scuff early and look worse than they are, which is cosmetic and should barely move the grade.
So a used JOOLA is mostly a question about the face, and a used Selkirk is mostly a question about whether you are being charged for cosmetic damage that does not matter.
Line for line
Against a Selkirk Vanguard, the closest JOOLA in intent is the Scorpeus — both are the control-leaning member of their family.
Against a Selkirk Luxx, the closest is the Hyperion: both thermoformed, both all-court, both the sensible middle of the range.
The Perseus has no real Selkirk equivalent. It is the most power-biased paddle either brand makes, and a player cross-shopping it against a Vanguard is not really choosing between two paddles so much as between two games.