Wrting a business plan - Should I do it on Word or on dedicated software?

Client is tendering to buy a business in Mauritius and wants a business plan for the bank.

I have not done this before so would welcome any guidance/advice/pitfalls to watch out. I am thinking of doing this myself and getting it checked by a more experienced accountant for a fee.

Initial Googling shows that there are dedicated softwares available for this. Are these any better than Word? Should I invest in one of them?

Thanks for all the advices on this