I have both a laptop and an ipad, and use them for different tasks.
The iPad is for everyday web browsing, (especially at the local coffee shop!), internet shopping, reading Kindle books, listening to audiobooks, and always goes with me on vacation.
The laptop is used at home for web browsing as I prefer the full sized "regular" keyboard, and for word processing, spreadsheets etc.
IMHO the ipad might not be sufficient for academic research and word processing.