The question has been closed for the following reason "The question was answered. Thanks!" by Mark Devens Aug 29 '10 at 21:54
Apple says that has 300 new things. Most things you won't use. Leopard is much safer, because it will back up everything to a external hard drive.
Tiger can run on most mac made after 1999, oldest being the Power Macintosh G3. Leopard can run on macs after 2002, but any iMac G4s from 2002 can't run it. Really on the Power Macintosh G4 from 2002 can run it. Every mac sold in 2003 can run Leopard. Time Machine will back everything on your hard disk, even leopard. This is useful if you Mac crashes(like that will ever happen!), get a new mac, or just loosing a porgram. It works with most Apple program, which makes it be able to open iPhoto 08(has to be 1.1 of 08) and let you get back a photo, or even the whole thing! Leopard runs any Mac OS 10 program, even from Tiger, but can't run Mac OS 9. which is bummer for some people. I was upset when i could not run QuickPlayer 9. There is a huge upgrade from tiger, but if your a first time mac user, go with tiger. If you know the mac, and you want to see more and make sure that you computer is safe, with not doubt go with leopard!
answered Aug 29 '10 at 21:50