This really depends on (at least) a couple of things: the wood itself, and the finish currently on/in it.
Scraping may work, but is very error-prone -- particularly for the inexpert or impatient among us. Also, depending on the specific type of wood and the "openness" of the grain, you might have to take a LOT off by scraping in order to really get down to bare wood. A chemical remover and a stiff-ish brush should go a long way toward removing the finish without removing wood (though it will likely raise the grain, but you'll want to finish sand it anyway).
On the other hand, you may not need/want to get down to REALLY bare wood, but just get the surface clear of finish and leave the existing finish in the pores as "filler" over which you can apply new finish. How well that may work, of course, depends in part on what sort of new finish you'd like to apply. Also, do you plan on staining it?
To pick the correct remover, you really need to know what the current finish is -- or do some trials on some small unobtrusive parts of the wood.