I get these products free through promotion at my work, so I have personally (my dogs) tried many of them, and I have seen first hand which work and for what. I have heard way too many seminars on fleas and parasites too
Frontline Plus : Excellent for fleas, kills something like 99.8% of fleas within 48 hours. Good for ticks. Waterproof. DOESN'T do internal parasites.
Advantage : Excellent for fleas. Not waterproof or for ticks. DOESN'T do internal parasites.
Revolution : good, but not excellent for fleas or ticks. Not reliable for heartworm since its topical, so don't use it for that. claims to be infective for control of ear mites (very rare in dogs!) and scabies. Revolution is actually a better product to chose for cats than dogs.
Advantix : No personal experience, hospital I work for doesn't carry...DO NOT use if there is a cat in the household, slight contact is very toxic to cats.
Sentinel :
MY PERSONAL FAV ! "Flea Birth Control" Fleas cannot produce eggs,
and existing and future larvae will die when they eat the waste of the fleas who had fed on a animal w/ Sentinel. PLUS ITS A flavored monthly TABLET, which means no getting the liquid on your skin, very important for pregnant women who are giving the medicine or children who are snuggling w/ Fluffy. ALSO prevents Heartworm , roundworms, hookworms, and whipworms.
Many people are worried their dog will pick up too many fleas on a walk or going to the park, but studies show that flea eggs drop from animals right after they wake up, so close to 100% of newly hatched fleas will be where the infected animal sleeps. Once a flea is on an animal, it DOES NOT leave its host (animal). It will feed and mate on the host before dying. This makes vaccuming the animal's sleeping area very important! Once the eggs hatch, the larvae will search out dark areas, whether thats under the bed, under the bushes outside, etc. so keep that in mind.
Sentinel can be mixed with the topical applications, so I keep Frontline/Advantage on hand to use about 1-2x in the summer if I see my dogs itch ( one of my dogs has flea allergies, so if she gets one flea on her, she's an itchin'). People who are just starting out on Sentinel can use Frontline or Advantage the first month or two get a start on killing the fleas.
ROTATE ROTATE ROTATE! These products all say they kill "99.8%" or "99.5%" in studies because some fleas will survive through the chemical...Use a different product once and awhile so you don't build up a colony of fleas that are immune to your favorite flea preventation.