After reading the other "favorite Superboy" poll that was all about different takes on Kon-El, with many posters wondering why the original Superboy had not been included, I decided to start a poll that puts Kon-El in direct competition with Kal-El.
For this poll, Kon-El includes all versions: The original version (which you can split in the "Kesel/David" and "Johns/Lemire" versions if you wish), the "new 52" version, the "Smallville" character, the "Young Justice" (TV) version, and various parallel-world/Elseworlds versions.
Likewise, "Kal-El" includes all versions of Kal as SuperBOY (not Superman), including the pre-Crisis version (which you could split into "Golden Age", "Silver Age", "Bronze Age", "New Adventures of SB", etc. versions), the "Superboy" TV series version, the more recent pre-"New 52" version, and various parallel-world/imaginary story/Elseworlds versions... except, for the sake of argument, Superboy-Prime.
I'm also including the option of liking the two Superboys about equally.