Tinyint is one of the Exact number data types that use integer data.
A varchar or variable character field is a set of character data of indeterminate length.
"I think tinyint is better than varchar in this case"
from question "Managing user points on Q&A site"
"As varchar n takes spaces much more than tinyint and your main table is table2 so the second scenario is more optimize"
from question "Is it more effecient to have a table with one of its columns mostly empty or make a new table and refer to it?"
"Using varchar is less efficient than using tinyint like aju john suggested in his comment but unless i m dealing with a really performance-critical or a huge table - i find it easier to deal with"
from question "Alternative to ENUM Datatype in MySQL"