What is the difference between allegra (fexofenadine) and flonase for allergy relief -take one or both?

Flonase better: Allegra is an atihistamine and is helpful for itchiness, sneezing and a runny nose, not helpful for congestion. Flonase, an intranasal steroid covers all these symptoms plus congestion. Head to head studies comparing Flonase to antihistamines, singulair, (montelukast) or sudafed showed that Flonase beat them all. I usually suggest daily Flonase and adding an antihistamine on as needed or supplemental basis.