Grafted avocado plant vs seedling, which should I buy and what is the cost?

For commercial planting, buy grafted plants of a named variety, not seedlings. Seedlings grown from seed are cheaper but they do not come true to type, take much longer to fruit, and you cannot be sure of fruit quality. Grafted plants cost more per plant but start fruiting earlier and give you a known variety. Per-plant prices vary a lot by variety and nursery, so compare several accredited nurseries rather than going by one quote. Plant population is roughly 70 to 130 plants per acre depending on spacing and whether you go for higher density. Insist on a healthy graft union and disease-free, well-rooted plants. Verify current grafted plant rates and the recommended varieties for Wayanad with your KVK and reputed nurseries before buying.