It depends what it is you want to be able to do. I've been using an iPad for a few years now and love it, but for some things I really need to use the laptop.
IPad is good for using its apps, emailing, gnetting of course, facebooking and browsing the internet. If you have an "air" printer you can even print stuff too. Also the perfect size for travelling!
However for more involved stuff like improving your photos, Microsoft word and all its components etc and whatever other programs you might use really need a pc. I have my laptop connected to my Cricut machine for crafting and while I could use it with my iPad I wouldn't have full function of the program.
I have no experience of any other tablets on the market (apart from the excellent Kindle Fire, which would be a good cheap option) so can't comment on that aspect.
I find somethings are just easier on the laptop so best option is to have one of each!!!