As mentioned, Stronghold only kills roundworm. However, tapeworm is associated with fleas so in theory if they haven't had fleas they haven't got tapeworm. I try to avoid products that treat multiple parasites if I can (unless I need to treat one of the specific mites) as they are very strong, so I use just Advantage on the cats but not on a monthly basis, only approx 2-3 times per year. However I cannot use Advantage on the dogs as one of them reacts badly to it, so they get Frontline Combo.
The best wormer on the market is Drontal - kills every known worm in the UK, but the down side is that it's a pretty big and nasty tasting pill. I don't have a problem getting it down my boys necks but for cats in the surgery who are more difficult, I can't recommend Profender enough - a "Spot On" wormer that lasts 3 months!