Wakesurf board for a big boys - Length vs Width?

Need a little advise. I'm looking for a board that'll work best for big guys. I'm 6'2" - 260lbs.s - I own a '09 Hyperlite board - 5"6" . The board works great for everyone under 200 lbs. I'm just too much of a load for it. My boat is Yamaha 212x with the ballast tanks. Boat throws a great wake.
I was comparing the Hyperlite Landlock ( 5'11") to the Grindwater Mauka ( 5'6"). The Hyperlite is longer but the Mauka is wider. Which is more critical for heavy loads - Length or width?

Thanks,

Max