varchar vs text - MySQL

Question

in my project an user can write comment [plain text], and view others comment, can delete own comment, but can not update comment !
In this case which would should i use

Answer 1

it depends on the application behavior. space allocated inside block's table decrease space for other columns and decrease density data inside it. if full table scan is used by mysql, many blocks are scanned, it's inefficient. so it depends on your sql requests.