I'd have to choose based on influence on me personally in bringing me closer to Christ. (If they don't do that then they are not worth reading.)
Depending on the day: 1) Jeremiah Burroughs, 2) William Perkins, 3) John Brinsley, 4) John Owen.
I have a number of individual volumes that have profoundly affected me. Ranew's Solitude Improved, Matthew Mead's The Christian's Duty to Walk Wisely, some by Henry Smith, Cornelius Burgess, William Spurstowe's Wells of Salvation, Christopher Love's Hell's Terror, etc.
I'd press choosing specific axiomatic changes in doctrine after reading certain books.
(Then there is Turretin and Edwards)...