What's your experience with the more recent non sedating antihistamines? I find that Allegra is pretty helpful with minimal to no side effects, Zyrtec doesn't

What's your experience with the more recent non sedating antihistamines? I find that Allegra is pretty helpful with minimal to no side effects, Zyrtec doesn't have a lot of side effects but isn't as helpful, and then Claritin is about the same benefit as Zyrtec with a bit of fogginess.