Vinylengine.com lists a SL-D3, SL-D30, SL-DD33, SL-Q3, SL-Q30 and SL-Q33, but no SL-SD33? If you've seen the Technics, does it have a straight or "S" arm?
Anyway, if the SL-SD33 is a straight arm it can only use P-mount (T4P) plug in cartridges so you'd be limited with cartridge choices.
The PL-7 is straight armed but takes 1/2" mount carts with more choices, although the arm is medium/low mass so will work best with medium/high compliance carts.
If the Technics has a S shaped arm then it will take 1/2" mount carts and is medium mass so would work best with a variety of medium compliance carts.
The PL-7 is definately quartz lock and has good specs, depending on which model the Technics actually is, it may have similar specs.