Prednisone and Dexamethasone for Asthma

Can we use Dexa instead of Prednisone when we are discharging patient home? old question and as I remember the answer was always Sure! but why are we asking still this question:

Symptomatic improvement following emergency department management of asthma: a pilot study of intramuscular dexamethasone versus oral prednisone. J. Asthma 1997

2 articles within last 2 months in Annals of EM:

1.A Randomized Trial of Single-Dose Oral Dexamethasone Versus Multidose Prednisolone for Acute Exacerbations of Asthma in Children Who Attend the Emergency Department

2. A Randomized Controlled Noninferiority Trial of Single Dose of Oral Dexamethasone Versus 5 Days of Oral Prednisone in Acute Adult Asthma.