各持己见；各执所见

词典解释

[each has his own opinion;each sticks to his own view] 各自坚持自己的观点和意见

然此辈执术疏谋生急,信口欺诈,甚至徒毁其师,子讥其父,各执己见,彼此相非。——清· 黄钧宰《金壶七墨·堪舆》