i wouldn’t worry about it too much becuase your experience will be different, eventually you’ll try both. Not only do slick and poly have different feels but i also find that dyed string of the same type compared to the white version of it, have different feels as well
o and i prefer poly, seems to whip better for me and just last a little longer in general, both play great and will work fine
also if your a looper i highly recommend slick 6 or 8 string