Way I see it, do what you can with what you got. A lot of people will tell you all kinds of things, but if you wait till you have the best equipment, nothing will ever get done.
I started making 3d animations on a $300 laptop with 2 gigs of ram and an intel 4500 video card.... actually still do, lol. I also didn't have a mouse, or a desk. I laid on my bed with the lappy on my stomach and made 3d models like that. My neck hurt for months.
But from a technological standpoint, yes, desktops are generally superior to laptops, but there are plenty of laptops that have more than enough power to do whatever you need it to do.
Use whatever you have. If you're in the market, go for a desktop, they're easy to upgrade later.