I can answer that for you.  There are many differences between celery and leeks. 

Celery is a vegetable and herb (Apium graveolens) of the carrot and parsley family, cultivated since prehistory and found worldwide; while leek is the vegetable Allium ampeloprasum, of the lily, onion, and garlic family--having edible leaves and an onion-like bulb but with a milder flavor than the onion--and cultivated since ancient Egypt or Mesopotamia.

Leeks are lower in sodium, while having more protein, vitamins, and minerals-- excepting Potassium, B2, and B6, which celery has more of. Celery is significantly lower in sugar. 

Leeks are typically less expensive than celery.  

Can I assist you further with celery or leeks or anything else?
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