Which champ is better to buy xayas or gnar?

Hi i have xayah in my free champ rotations but i got skin for gnar(SUPER GALAXY GNAR) and now i want to buy it,but how i got better at playing xayah and got twice s on that champ now i dont know which champ to buy xayah or gnar.If someona has a gnar or xayah i would like them to advise me which is better.
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