You can print wireless with an iPad. You will need an AirPrint compatible printer, or another computer to act as a print server (kind of defeating the point, really).
I don't know what web development is like on an iPad, but if you personally edit your website using HTML, CSS, etc., I would definitely say get a laptop.
But if you're just updating your website through some kind of management tool, updating Facebook, checking email, etc., get the iPad.
You really need to consider what you'll be doing, and whether it's better to do each on a tablet or laptop. I personally would always choose a laptop over a tablet, but that's because I use my laptop for much more than just checking email and Facebook.