Moggy or pedigree cat?
You will see from my web site (www.madaboutmoggies.com) that I am prejudiced in favour of moggies (i.e. ordinary non-pedigree cats)! I suppose this is partly because pedigree cats are usually brought into the world deliberately, whereas moggies are often the result of human negligence or carelessness (e.g. in not getting cats neutered). So there are always countless moggies needing a home.
But having said that, I think it depends on what you want in a pet. If you are choosing a cat, get to know the characteristics of various breeds. Siamese cats can be wonderful companions - intelligent, affectionate and communicative. Persians and other long-haired oriental breeds are very beautiful to have around but demand a huge amount of attention and care. For instance, long-haired cats absolutely must be groomed at least once a day, which is very time-consuming. If this isn't done, the coat will become matted, and also the cat will swallow large quantities of hair when grooming himself, and develop hairball. You need to be sure you are ready for this.
Personally, all my life I have had only moggies, and the fun and pleasure they have given me has been an immense joy. They all have their different personalities and can often be very funny. A moggy kitten can usually be taken from its mother at an earlier stage than a pedigree kitten. This means they will often bond with you more readily and will fit into family life with very little hassle.
But, as I said at the beginning, I am biased! Let me know what YOU think!