I like which is how you say it in English.

"I like which one."

"I want to know how to write '我喜歡哪個(gè)' in English."

I like the phrase "I don't want to discuss my personal preferences here."

My fondness for which do you wish to know translates into what, for me it translates into the phrase "Which do I enjoy?" with a contemplative undertone as if I am pondering your question.

I like which is written in English as "Which do I like?" Here's a succinct breakdown in a regional Chinese dialect:
1. 覅問覅半，我喜歡你——METFAN presenta, wo xǐhuan ni 2. 你歡浩啥子呢？——Ni huanhao shénme ne 3. 我蠻喜歡儂滴——Wo man xǐhuan nong di

I like which