then it makes sense to go for a large mug. it should, however, remain practical. it should also be able to keep your coffee hot or warm for long. if, on the other hand, you don't take a lot of coffee, choose a medium or small one.
this greatly depends on your personal preference. do you want a mug with or without a handle? it is important to note that if your mug is made of a material that conducts heat, then it definitely needs a handle. consider the size of the handle to make sure it is comfortable for you.
some mugs have lids while others have none. depending on your 