As mentioned before the mac is faster on startup the macbook air is almost instant and you do not need any anti virus software, that is a biggie as that really slows your pc down.
Here you're quite wrong. Due to Macs' popularity viruses are indeed out there for them. The only reason Macs didn't "need" antivirus is because they were such a small % of the market nobody bothered writing big nasties for them. That's changing. Rapidly.
For example photography and design things you have more professional programs available for the mac and like my bookkeeping and invoicing pc has more software available.
This is also not true. If anything, there are fewer programs for Mac.
Margo-
Your choice of operating system isn't going to speed up your download speeds any signifcant degree. That's limited by your ISP and the actual "wire" your connection is coming in on.
I have no dog in this fight. I did Mac tech support for years, I use PCs that run Linux and my whole office runs Windows.
My parents LOVE their Macs. My sister adores hers. A lot of people adore their Macs. I know tons of folks who love their Macs. I also know a ton of folks who have been disappointed and outright enraged. Here's what I've learned:
1) You get less hardware for the money. With a Mac, part of what you're paying for is the brand, the pretty package and the experience. Dollar to dollar and component to component, you get LESS "engine" for MORE money. I know that for a lot of people they are perfectly pleased with this, the hardware is fully adequate for their needs and they'll pay for the pretty. Heck, we're horsepeople, right? White socks don't make the horse any better, but man, I will pay a little more for chrome just because I love it!
I know I think my father's Air is just beautiful. I would love to have a laptop that looked like that. It's gorgeous. And I find his stories of how he'll be flying around the world, his prescious Air will (on occasion) have a problem and he'll just go to the nearest Apple store (except when he's in say... Honduras) and viola, problem solved. I'm like "Wow, Dad, that's so epic." Because, frankly, that IS pretty epic.
2) Depending on where you buy it you may NOT be able to just take it to any Apple Store and have them fix it. Choose your vendor very, very, VERY carefully. If you want to buy it for the full Mac experience you probably want to buy it directly from Apple, and not through another retailer. This may end up costing you more. I know a few poor souls who purchased their Mac from a certain vendor only to find out that Apple transferred warranty service to said vendor.
2b) If you live in a very rural area with no Apple store nearby for that vaunted Apple service, then you have to consider if the Apple experience is even something you'd get to... you know, experience!
3) Lack of upgradability (is that even a word)? Now this isn't a problem for a lot of people because they run screaming at the idea of opening up their computer case and touching anything (even though in today's day and age I kind of think that being able to put in RAM sticks or change a harddrive is as necessary to know as how to change a tire...) but it's worth noting. With my PCs I can increase their useful lifespan by upgrading components. The three easiest components to upgrade are frequently the three that dramatically increase performance and lifespan: memory, video card and harddrive. Whole new computer? Not necessary. Mac doesn't make this very easy to do. It can be done, but well... it's just easier and cheaper with a PC.