It's *****.. I grew garlic in my garden last year, the specific breed was 'picardi wight' ... and the difference is unbelivable... you have to hang them and/or dry/cure them a little bit when you harvest them...but they were so much more juicy and smelly..
Like seriously, if you chop up some home grown garlic you will stink for days unless you clean properly.
Conversley, supermarket garlic seems really weak ...if a recipie calles for 2 cloves, you have to put 2 whole bulbs in to even taste it.
It's really easy to grow aswell.