Depends on who's driving, what you're driving through, and how much you want to spend building.
Check out the cover story, that red sidekick with a body lift, armor and a nervy driver is running with well built samurais.
With what a decent samurai is costing now, I think that the cost is about the same or less to get a sidekick up on 30's with a locker in back.
The aftermarket support, samurai t-case gearing options, and the simplier leaf spring suspension, give you more options to take the samurai beyond the basic 30's.