Memes

From a practical standpoint, the person is theoretically easier to get rid of than the roaches because there's almost certainly only one of them and even if there's two, of opposite sex, it takes considerably more time and effort for them to produce any more of them and even then more than a decade before those offspring can themselves breed. That said a person is as big as at least 1000 cockroaches and has more natural defences.

It's a bit of a conundrum because there's probably more readily available resources for getting rid of roaches than a person, but they're probably less effective than most anti person resources that you can get if you can get them. You could try the anti roach tactics on the person but you'd have to get like a lot of roach spray and a lot of protective equipment because the cornered person is pretty dangerous. You couldn't even really call in a professional either because I reckon they'd likely run away when they discovered they weren't dealing with roaches.

Depending on your area the local police would probably be the best stand in for pest control at this scale and probably pretty effective too so ultimately the person is probably the better option of the 2 but that said it'd be an awful lot more disturbing than the 1000 roaches. There is at least the option of becoming friends with the person though which is not really an option with the roaches.