When a pod is picked, deterioration is rapid 5-6 hours and you can taste the deterioration. The quality Branded Freezers aim to have them from the Vine to Frozen in under 3 hours and so the frozen product is definitely superior to any pea that the market can provide, which has usually been "en route" for 24, or more, hours to get to the shop, let alone your kitchen/cooker.
On the Plant a Vegetable theme: Little Gem, Cos Lettuce and Celery, kept chilled with their roots/base in water will carry on growing while in your fridge!
I can recommend (oh dear that looks wrong whichever way I spell it) the green stay fresh longer bags from Lakeland Plastics for root vegetables for keeping in the fridge, especially carrots and parsnips.
I get my sprouts from a local smallholding, as fresh a I could want.
Don't envy me in the late winter, though, when the sprouts are over and the stalks are pulled and left to rot in the field. The smell of the plants in their decay is far worse than anything that is formed as a result of eating them. It pervades the whole village and is so strong, you can almost see it.