Which is better for a nasal allergy levocetrizine or ceteizine hcl?

Both are good: Everyone responds differently to allergy medicines so it is what works best for the individual.

Not much: Although levo ceterizine is a third generation antihistamine, there is little difference between that drug and ceterizine (zyrtec). They are both fairly non-sedating antihistamines and are approved for allergic rhinitis. Their efficacy and safety are essentially the same.