> Specifically with airfare, a 3rd party is not allowed to sell for less than the airline directly, so it's always better options since it is much easier to reschedule/cancel/refund directly with the airline.

The last couple of flights I booked with Star Alliance were the same price on Lufthansa.com etc., but I got free checked luggage on booking.com/expedia and just hand luggage on lh.com.