Psi has more than twice your bot's drive. And real wedges. And side protection. And good wheel choice. And not aluminium armor (i'm nearly sure it hasn't)
I'm going to just say it outright: Lu-Tze can beat SM.How do I know? She kicks the crap out of Grog every time. The freakishly fast box rush'll get her under SM, then chew him up real good.
You got my vote for RA2 Wizard. Always and forever.
do realize that arena is also wider, giving you more time to speed up your weapon.