Both table salt and kosher salt are perfectly fine for seasoning or decorating -- michelin starred restaurants use both for each purpose. The only important thing to note is that they have different saltiness grades. Table salt is finer and thus saltier. Real problems emerge when not distinguishing between the two -- either a dish is far too salty or completely under seasoned.
Just specify what you're using and how much and the person using the other one can adjust. 3 parts kosher is about 1 part table salt.
It gets way more confusing if you go to Japan -- instead of 3 or 4 salts. There are 00s. The Japanese are big in to salts.
Kosher salt is a fine compromise for most situations.