-->"either" PRON 代词(用于否定句)两者都(不) You use either in a negative statement to refer to each of two things,people,or situations to indicate that the negative statement includes both of them.意为两个城市都不太喜欢.
-->用"each"则表示部分否定,意为并不是两个城市都很喜欢,有可能喜欢其中一个.
原文意思是应该是两个城市都不太喜欢,所以选"either".