Short answer: it doesn't matter at all.
Actual answer. In the loading process, you'll need to unroll the film until you reach 1 at the counter. Usually with manual cameras, you shoot several empty (black, without light) images (which will overlap with the film that was exposed when you placed the film in the camera), until you reach 1. In order to do so, the practice is to go to manual, setup a speed that is not too slow (1/125, 1/4000, 1/30 for instance are OK), and shoot.
This really doesn't matter since you're not supposed to do anything with those images; they can be empty or not.
The speed actually matters when you reload a film that was partially exposed (eg., you shot 10 of 36 images). You'll need to reach the view 11 or 12 (for safety) by shooting images completely black; in that case, the practice is to accumulate: putting cap, close diaph, put maximum speed, cap the viewfinder, put the camera in black bag or room. In that case, you leave the 10 first images untouched.
Of course, any deviation to those practice are fine for specific practice, artistic purpose.