Goodname,
Would you have any documentation for that claim? What kind of situations are you talking about (e.g. using certain indexes, certain databases)?
Parametrized queries can allow the database query planner/optimizer to preplan the query, so it runs faster when repeated.
I don't know if it's faster or slower when run only once, but the practice of using parametrized queries is quite standard advice these days.
Anyway, if you have more details on this, perhaps a note on the Using SQLQuery wiki page might be nice, so we keep as much relevant info in one place as possible.
Note that you may also have to deal with formatting for date/time fields that can depend on database backend.
Still, it's a free world so if you don't want to use parametrized queries... be my guest. I'd just be careful in advising this to database newcomers...
Thanks,
BigChimp