Choosing to buy 2 year old seedlings:
+ First harvest 1 year earlier
+ No care required as 1-year-old seedlings (can do without black surrounding soil, no trimming works etc.)
+ Almost no plant dropout (2-year-old plants are more durable and stronger)
+ Savings on finances and work, which would be needed to grow plant for 1 year: watering, fertilizing, weeding, cutting, replacing seedlings, etc.