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PTE: Computer based. You need to type the essays (easier if with corrections). You will talk and be assessed by a computer. So if you know the techniques, you may be able to get better grades. Easy to book. But still you need to have good vocabulary which will help you a lot to get good marks.
IELTS: Essays using paper and pencil, which can be difficult to edit. Assessed by a person which can be good or bad. scheduling for IELTS is more difficult.
Have you seen the new statistics page we have introduced? Check out this link and keep an eye on the Statistics section for new modules to be added in near future!