if ya got drums u should always chop on there, it all depends on if ur trying to sample phrases or individual sounds, the best thing to do after u put a record on is listen to it while ur rippin it, then decide after ur done if ur gonna chop up sounds or sample phrases or even loops, then you'll know exactly what ur doin, u almost never want a kick or a snare in the middle of the sample tho, either chop so the drums at the beggining or chop where there are no drums