There are two main kinds for sale at most outdoor shops.
(1) The Garcia keg style which is pretty awkward and heavy.
(2)Then the bearvault, which is lighter and made with transparent plastic. The problem with bearvault is that they are not recommended in areas of ADK because one bear (now deceased) figured out how to open them up and has apparently taught her progeny.
Those are the two most common type of canisters available. Getting away from those are some boutique canisters.
(3) the bearikade is the Lamborghini of the canister world. Lightweight because it is made out of carbon fiber but it caries the Lamborghini price tag along with that carbon fiber. Also, the bearikade can't be used in grizzly bear areas because it failed testing with grizzly bears. Additionally it appears the smallest bearikade is not on anyone's approved list yet.
(4) the bareboxer is a garcia style canister but really small, so it ends up being quite lightweight. It is probably a good option if you are a compact packer and only go out one or two nights.
(5) The lighter1 canister is fairly new to the market so I haven't been able to find many independent reviews online. It is like a small bearvault with a metal lid that can be used as a pot to boil water (multipurpose). I think some of the advertising on the website is a bit deceptive so you have to be careful with the reported weights. Even with all of that I think there is a lot going for the lighter1 and plan on picking one up fairly soon.
(6?) Ursack would like to be included on this list. It is a lightweight kevlar bag that is supposed to be bearproof. It has the best stats but as far as I am aware it has never past independent testing and is not on anyone's approved list. Even if it is bearproof your food is most likely destroyed which could bring an untimely end to your hike.
First you need to figure out how much room you need. Go to a shop and check them out. think about how much food you bring and how small of a space you can cram it into. Then think about how much you want to shell out and where you want go hiking…. There are pros and cons of every canister out there so there isn't a one size fits all answer. Nobody really like carrying a canister because they are so heavy but we have to protect the bears.