Haha... good choice. I had to make that same decision too.
Used to keep fake plants in. But after he got a scratch, I took them all out.
Once he's grown in an empty tank though, he might not be happy when you add stuff later. Mine's no longer skittish, so I tried putting it some of the plants again. But he threw a tantrum. Kept darting around the tank and splashing near the surface. He calmed right down once I took them out.