Database Table Design Question

I have a GUI that is launched within projects (there are many thousands of projects). The user has a selection that gives two choices. They choose one or the other (radio buttons that only allow 1 selection). I need to store this in a table. I'm wondering what the most efficient way to do this would be? The table will get very large over time.

Table Option 1
GUID (Pk) - VarChar2
Choice - VarChar2
*** When the user selects the option it will input the value chosen into the Choice field. The value inserted will be a text characters that are lets say 2-5 characters long. There will only be two options.

Table Option 2
GUID (Pk) - VarChar2
Choice1 - Number
Choice2 - Number
*** When the user selects an option it will set the selected value to 1 and the not selected value to 0. So the table will store both active and inactive values.

I also thought about doing the single choice option like Table Option 1, have the value be a number (where 1 is choice1 and 2 is choice2). For efficiency reasons I think that would be best, but anyone looking at the table will have no idea what number matches which what choice. Which is why I'm thinking of going with the Option 1.

What would be more efficient Table1 or Table 2? The reason I ask is because Table 1 has text to store, while Table 2 has two columns, but they are numerical values? Also, if you have a better table structure to store them in let me know. Just trying to get better at DB table design.