You should pick FCL shipping in the following cases:
When your cargo weighs more than 10MT: You may be better off booking a FCL shipment as FCL rates, in this case, could be lower than LCL rates.
When your shipment is urgent: LCL cargo can take longer than FCL cargo to be shipped because it doesn’t occupy a full container and needs to be consolidated with other cargo before it can be shipped. FCL shipments, however, occupy the entire container so there is no waiting involved here.
When you want your cargo safe: In FCL, you have the entire container to yourself, hence minimising the damage that can occur when your cargo comes into contact with the (possibly bulkier) cargo of another shipment.