I voted just to max him out, cuz that seems to be where the money is when it comes to staking. It is very easy to get fights, and you can literally fight anybody. With lower stats, you will have to pick you fights very carefully to make sure you are fighting a fair opponent and aren't going to get owned by somebody with better stats than you.
I guess you could also get him 99 attack and leave the strength low, like 60-70.