yep both vector and colibri are very good i also sometimes use king not as good as those but still filtered 3 times and i notice no difference in the finished product but regardless vector and colibri are best.
to those concerned you can run some activated carbon at the end of your tube to remove any impurities which even the best butane contains to some degree.
Cans will say on side "near zero imppurities" if its any good. best test is to squirt some on a clean mirror, if theres impurities it will leave white residue on the mirror