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If you're using perforated PVC pipe, you'll want to sock it, or cover it with filter fabric before using pea stone. You risk having the stone clog the pipe due to its size. Pea stone will also be slower to drain since the air space between the individual stones will be smaller than the 3/4".
The only advantage to pea stone I know of is it's a little easier to shovel and rake out. I don't think the drainage performance is on par with 3/4" or larger clear stone.
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