What is better for ringworm ketoconazole or oxistat?

Ketoconazole Tablets are indicated for the treatment of the following systemic fungal infections: candidiasis, chronic mucocutaneous candidiasis, oral thrush, candiduria, blastomycosis, coccidioidomycosis, histoplasmosis, chromomycosis, and paracoccidioidomycosis. Ketoconazole Tablets should not be used for fungal meningitis because it penetrates poorly into the cerebral-spinal fluid.

Ketoconazole Tablets are also indicated for the treatment of patients with severe recalcitrant cutaneous dermatophyte infections who have not responded to topical therapy or oral griseofulvin, or who are unable to take griseofulvin.

OXISTAT Cream and Lotion are indicated for the topical treatment of the following dermal infections: tinea pedis, tinea cruris, and tinea corporis due to Trichophyton rubrum, Trichophyton mentagrophytes, or Epidermophyton floccosum. OXISTAT Cream is indicated for the topical treatment of tinea (pityriasis) versicolor due to Malassezia furfur.

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OXISTAT Cream may be used in pediatric patients for tinea corporis, tinea cruris, tinea pedis, and tinea (pityriasis) versicolor; however, these indications for which OXISTAT Cream has been shown to be effective rarely occur in children below the age of 12.

Both are mainly for dermatological ailments, check with your doc./pharmacist for better results, hope this helps.