Where Rex MD fits
Rex MD is a credible second pick to Hims (Men's Health). On the core ED medication menu (sildenafil, tadalafil), pricing is essentially identical. Where Rex MD differentiates is premature-ejaculation treatment, which Hims treats but does not market as prominently. Rex MD's PE-specific intake surfaces both topical and oral options (lidocaine sprays, paroxetine off-label) more clearly.
Where Hims wins
Hims has a broader overall menu: testosterone replacement therapy, mental-health adjacency, dermatology partnership (Hims Skin for PFB and skin-of-color care). Rex MD is narrower: ED, hair, PE. If you need only those, the operational difference is minor. If you may eventually want any of the other Hims tracks, the consolidated billing of Hims is simpler.
The cheaper alternative
For ED specifically, generic sildenafil at a retail pharmacy with a GoodRx coupon often runs $5-15 for a month's supply, versus $20 through Rex MD. The premium pays for telehealth consultation, subscription auto-refill, and discreet shipping. If you have a primary-care doctor who will write the prescription, retail pharmacy is the cheaper path. Rex MD's value is the bundled convenience.