For FERRET OWNERS: better to get 2 or 1 ferret?

well im thinking of getting a ferret some day and i read somewhere that if you get one ferret, it will really become like a bestfriend to you like a companion but if you get 2 ferrets, theyll have a blast with eachother but wont realy care much for you, is this true? and for those who have ferrets, can you give me 'ups' on your ferretS? like the pros and cons of having them? how hard was it to litter train them? what method did you use?