I haven't got cats but do have dogs. Frontline is brilliant for fleas, lice and ticks. Stronghold I like because it does fleas, lice, earmites and heartworms. Heartworms are something that not a lot of people know about and can kill and I believe the normal wormers (even drontol, which I swear by) do not kill heartworms. Also earmites are horrid things and with two dogs that both have 'flappy' long ears stronghold is a boon.
However! Stronghold does NOT kill ticks! Lo and behold I found a tick on my beloved little girl's leg earlier this evening and have been trawling the internet on ways to get rid of it. I remember our Springer having one several years ago and thought I could vaguely remember the vet spraying frontline spray on the tick. Anyway found what I was looking for and YES if you spray the frontline spray direct onto the tick it will kill it within a couple of hours and then it falls off within a couple of days.
So my suggesting would be to treat with Stronghold on a regular basis and have a small bottle of Frontline spray to hand just in case one of those horrid ticks decides to jump on board. I know you can buy tick removal tweezers but to be honest I (and a lot of people it would seem) are rather squeemish and frankly worried/scared of pulling the tick off in case the head is left in the poor animal. So it seems to me the Frontline spray is best all round to treat these little tick blighters. I shall still take my little girl to the vet to have the tick removed in the morning but that is because I really hate the things and also have a real spider phobia and know that ticks are related!!!!!!!