I have a darling cat who is 13 and in good health. DH and I have been talking about getting another one, but I'm stuck between getting an adult cat or a kitten. Our first port of call will be our local Cats Protection League who seem to have both 'in stock' as it were. I understand that we'll have to have a house check but we have a safe, enclosed garden, a catflap in the back door and anyone who spends half an hour in the house knows that the cat rules the roost 
I feel a bit guilty about going straight for the kitten option but current cat has always been an only. Am I right (or wrong) in thinking that he'd find a kitten easier to cope with than an adult cat? He's not aggressive or territorial (seems to have come to an arrangement with neighbouring cats about access right across the garden, shed roofs and such) but my DM has always maintained that cats have a pecking order, and as such, I should get a kitten who will know it's place, WRT current cat.
Am I over-thinking this? I love my cat so much and he's been with me for so long, I'd hate to do anything that unsettled him 