Hi community - long time lurker here . I’ve been on the uni progressions since release date and am interested in the aggressions but am unsure about how the sizes compare being mid aspect . Just trying to grade what sizes suit what waves using the p as a reference - like would the 140 p and 130 a be used in the same size swell.? Any help with not buying the wrong size would be very appreciated . 
How much do you weigh and what size waves do you want to ride? I’m 75kgs and have the 115 and its great when waves are on, but struggle in smaller surf. I would ride a 130 is most sessions up to chest height.
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As Digitalove said. You weight plays a big role. I’m only 66kg and only have the 115 Aggression. It does need a bit more energy than the progressions to be in the sweet spot. That being said, I do sometimes take it out when I feel the evo 115 or Progression 125 may be better, but do not regret it. Just have to pay attention a bit more. Being lighter, I probably can get away with it. I can only speak about the 115. So, 115 Aggression can be used where P125 would be, just a bit more input. I would say if your looking for similar conditions for a P140, Aggression 150 may be the one.