I can't compare them from experience, but the max daily pregabalin (for new scripts) is 300-600mg (in three doses; depends on whether it's for shingles or diabetus);
and for baclofen, they start at 15mg for three days, topping out at 80mg/day (all in three doses).
Both of these build up tolerance fast, so really its gonna depend on how much you normally use. I mean, if you never tried them, go with the starting daily max, right? (Plus the Lucid XP50% or whatever you need). So 600mg pregabalin or 80mg baclofen, no booze. Maybe split those doses, though, please.