They are identical products. They are just branded for different markets.

Each tube covers a month, so this product is good for 12 months.

Do you mean Advantage Aqua? Advantage only cover fleas, Stronghold covers fleas and intestinal worms including very important heartworm. If you are asking about Advocate, it does pretty much the same thing with Stronghold with different ingredients.

There is no difference between Revolution and Stronghold. Both produced by the same company (Pfizer) with the same formula. Pfizer sells them under different brands on different regions. (e.g Revolution in US / Stronghold in Europe). You can cancel your auto delivery anytime by login on your account through our website. Or if you can notify our support team, they would cancel your auto refill without any problem.