As much as I love Adrian_Medium, I will say if you're using OpenUTAU you're better off with something in VCCV or CVVC. OpenUTAU has Phonemizers, which make it so if you type a word in and the voicebank being used for it is in the correct format, it'll automatically assign phonemes. I'd personally recommend AERIS VCCV, as she's a high-quality voicebank in English. Do make sure you have storage space on your computer, as UTAU English banks take up a LOT of space.