I wouldn't mix it up. In my opinion it's too risky to stand in front of him and wait for head kicks, so taking him down is very easy decision. You have a huge wrestling advantage so you should be able to take him down without any problems if you have any takedown skills. No need to be unpredictable.
He's a white belt so you'll destroy him on the ground very likely.
I'm not sure though would it be smarter to rush for that takedown with high aggression or take it by countering.