I do not think size is a huge factor. When shrimping places like the hood canal where the season lasts @ 4 hours on the days its open I would think accessibility with good retention is critical. You want them to get in easily but get out with difficulty.

The max allowable pots per boat is only 4 even if you have 10 licensed fisherpeople onboard.

Bigger might be better in places where you can soak pots overnight if they allow more bait IMHO.