To avoid mistakes and confusion it is always better and safe to recite the verses you are sure about and you have memorized well. If your mistake is with the recitation of Fatiha make sure you repeat the rakat since there is no salaah without Fatiha.
Recitations other than Fatiha are sunnah and even if you make mistakes your salaah is valid.
Shaykh Waleed Basyouni answers and explains....
No transcription found