I used to use just linoleum. I would get the already-cut pieces from Home Depot/Lowes, fairly inexpensive.
The problem was that it would shift a little on my carpet, and the bunnies would find places they could nibble on, and make big holes in it. Then Amelia would start in on the carpet underneath!
The last time I overhauled the pen area, I got a full sheet of plywood, and had it cut into 2ft. x 4ft. sections, so I could get it home in my car. I layed the sections down in their area (in my living room), with no gaps, just re-arrange to fit in the space. Then I used the 2-sided tape meant for sticking linoleum down, around the edges and some big X's in the middle. I put a new sheet of linoleum down on that, being careful to not have any bubbles, then trimmed the edges. (There is a seam near one edge, but I put the litter box and a little rug over it, so they can't pick at the edges.)
It works really well for me. The bunnies do have slightly less traction, due to the harder surface, but they got used to it.