Depends on your budget.
To pass Dade County (=strict) standards, plywood needs to be 3/4 inch. This makes them very heavy to handle, and they need to be fastened well or they make great frisbees in the high winds of a hurricane. They are cheap but very cumbersome..
Window films (3M and others) have a place in reducing penetration by flying objects, keeping shards intact, and possibly in maintaining integrity when glass gets broken. However they do not provide definitive protection.
The corrugated panels come in a polycarbonate-like material as well as in light weight aluminum. They are strong, easier to handle but require the installation and take down for every threatened storm. If you have time, a ladder, and are modestly handy, they are a good if somewhat inconvenient option.
Permanent roller or mounted shutters make deployment easier, but they are expensive and ugly all year long.
The definitive solution is a specialized product consisting of two panes of shatter-resistant glass sandwiching a very thick film of amazingly tough film. You cannot gain access through these with a sledge hammer if properly installed, and they are sold as complete windows/doors.
Story in the paper last year about a guy who went all out. $50,000 worth of the best windows, doors, etc. Hurricane came along, knocked down a tree which fell on his roof and the house was totaled.
So, it's a matter of finding the sweet spot in term of expense v. protection. We filmed our windows, braced our roof to the joists and have a solid brick house. That's about it. Main thing is if the real deal is headed your way get out of Dodge. Houses can be fixed and are insured.
(This is the rationalization argument I'm using for the RV I am about to buy: makes a great "survival pod" when it's time to leave and the power is turned off (they do that for safety reasons shortly before the hurricane hits). Once you get to safety, no hassles about finding a hotel, power, a dog kennel, hygiene, or food.)