I am new to biking and need a little help finding a good bike at a reasonable price. I am interested in finding a bike for casual riding a maybe one or two sprint triathlons a year. I went to a local bike shop and was advised to get a 52-54cm. Are these a decent value? Thanks for your help.

54cm TREK 420 -21spd Brifters, alum frame, 700c, new tires

Trek 1500 Road Bike (54cm)

Specialized Allez Road Bike 52cm