Comparing insert and insert_recordset

Comparing insert and  insert_recordset 

insert()

static void prodinsert(Args _args)
{
 EcoResProduct                           ecoResProduct;
 EcoResProductIdentifier                 ecoResProductIdentifier;
 
 ttsBegin;
 while select ecoResProduct
      
  {
   ecoResProductIdentifier.Product = ecoResProduct.RecId;
   ecoResProductIdentifier.ProductNumber = ecoResProduct.DisplayProductNumber;
   ecoResProductIdentifier.insert();

    }
     ttsCommit;
    

}

insert_recordset()

static void Ecoresprodinsert(Args _args)

{ 

EcoResProduct        ecoResProduct; 

EcoResProductIdentifier        ecoResProductIdentifier;
;   

insert_recordset ecoResProductIdentifier(Product,ProductNumber)


  select RecId,DisplayProductNumber from ecoResProduct;      

   {           

    info(strFmt("%1",ecoResProductIdentifier.ProductNumber));
   }

  }

by using joins

https://msdn.microsoft.com/en-us/library/aa635694.aspx