The best one is that one that best suits your needs and intended use. If it were me choosing between the two, I'd opt for the Softride Qualifier Seriously, tho, I'd opt for the Cervelo because the seatpost allows for a great variety of positions.
OOOPs.
sorry, did not see tri bike, thought the question was best bike. the 5200 is a road bike. But there are lots of tri bikes on ebay at really good prices....Just look hard...