It really all depends on what’s growing & in the air at the moment.
I’ve not noticed any difference b/t Allegra & Zyrtec. Just make sure you’re not taking the D-version, it’s going to dry you out & make matter’s worse.
Claritin never did anything for me. Allegra or Zyrtec seem to suffice, but I can’t say either totally does the trick.
At this point, it’s whatever I find for cheapest. And as of my last trip to Costco, a 365-day supply of generic Zyrtec was $14.99. So, Zyrtec wins!
In the end, what really helps is sinus surgery 