Basically, I like short poems. Among short poems, this one was the best.
Literal
Basically I [topic-は] short-poems [subject-が] like. Short-poems [possessive-の] among [comparison-では], this poem [subject-が] top was.
Two direct, opinionated sentences. 基本的に (basically) uses the ~的に adverbial form. 好きだ predicates with the masculine 俺 as topic. ~の中では (among X) sets the comparison frame. トップ is a loanword used naturally for 'the best.'