When comparing Arkham Horror vs Pandemic Legacy, the Slant community recommends Pandemic Legacy for most people. In the question“What are the best board games?” Pandemic Legacy is ranked 19th while Arkham Horror is ranked 21st. The most important reason people chose Pandemic Legacy is:
With individual plays regularly ending in teasers and cliffhangers players will be eager to play the next round in order to move the story forward and find out what happens next.
Specs
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Pros
Pro Lots of expansion boards available
Currently there are 8 licensed expansions on the manufacturer's site. There are also many fan made expansions available online as well thanks to the games large and friendly community. Both the manufacturer's and community expansions add plenty of new content to the game including cards, investigators, board addons, Heralds (mini-bosses), Ancient Ones, spells, and items.
Pro Scales well from solo to large groups
The game supports up to 8 players, which is something of a feat for a game of its size and components. Makes for a great party game due to the size of players it allows. However, at the lower end it can also be enjoyed with one or two players, making it great for intimate gaming session. No matter how few players you have available, you'll be able to enjoy the game.
Pro Great challenge for those that enjoy difficult games
The win conditions of the game are quite slim and require one to know the rules ins and outs, so while not a game for casual players it is a game for the hardcore who enjoy a challenge.
Pro Well-crafted
Big map, lots of items and heroes with their own graphics, player figures on plastic stands; lots of tokens and monster cards made of firm cardboard.
Pro Lots of choices
Each location offers you different opportunities to trade for and to explore. The imaginary hero class (like tank, mage, support, stealth) is up to you and usually not well-tied to hero abilities.
Even when apocalypse comes, you still (might) have a chance to defeat the planetary evil.
Pro Great atmosphere of Lovecraft tales
Your weak heroes have to dive into parallel realities, use magic, defeat unknown guests and apply unique artifacts. Each game's location has its own secrets and 'contacts' with various outcomes — good and bad.
Pro Role-oriented
You either choose by yourself or get a random hero, and play with them the whole party (if you were not killed, of course). You and your hero have skills, items, unique qualities and effects, and their story.
The game itself encourages role-playing elements to dive into the Lovecraftian environment.
Pro Highly cooperative
Though the rules do highlight "best players of the game" via basic calculations, the game itself is aimed towards collaboration. To win, everyone must commit to the victory, and you often forget about the existence of a "best player".
The game allows players to exchange items or help other players via skills, special abilities and magic. In practice, players often compete their tasks in pairs and more, e.g. they close gates in pairs, where one has to clean the entrance from monsters, and the other seals the gates.
Pro Each game is unique
The game starts by choosing a random boss and/or heroes. Each turn begins with the myth phase, whose effects apply from a random card in the deck. These effects include monster movement, game-wide buffs and de-buffs, quests, monster gate breaches, etc. You will never know if you will be able to win the game.
Items and skills are usually taken randomly too.
Pro Very high short-term replayability due to the persistent story in the game
With individual plays regularly ending in teasers and cliffhangers players will be eager to play the next round in order to move the story forward and find out what happens next.
Pro A persistent campaign means that your descisions have consequences, both good and bad, in future games
Pandemic Legacy is the latest in the Legacy line of games where things that happen in one game can, and often do, have affects in later games. The characters you use can gain new abilities and or flaws, components can be added and/or destroyed and rules can be added, amended, or removed, all based on the things that you do from game to game. This helps players feel invested in the game and makes their decisions even more meaningful than they already were. This ongoing change also means that your experiences may very well be unique to your group and that other campaigns of the same game will go drastically different, with only main plot points in common.
Cons
Con Very unaproachable
Arkham Horror has a lot of moving parts, its rules are difficult to follow, and the gameplay itself is pretty difficult. This all adds up to a game that is very unapproachable and will take the most dedicated of players to really understand the whole concept put forth.
Con Huge rules
24+ pages of rules. Though they are well-written, highly illustrated, enriched with small data tables, it is easy to forget small details, especially when some critical rule is applied, e.g., for just one type of bosses.
Con Long
The game is very long (several hours).
Con Playing alone or in small team (2-3) is usually easy and boring
Arkham is best enjoyed when played by teams of 4 and more.
Con Long preparation time
Laying out all the things may eat up to 30 minutes (without extensions).
Con Hard to find
It was actually released in 2005 and currently out of stock at official page.
Con No long-term replayability
After the main campaign is finished (12-24 games) the game is mostly finished. Technically you can play the final mission over and over, but permanent changes made over the course of the playthrough, such as stickers added to the rules, board, and player sheets as well as components that are physically destroyed make the game less fun to replay after the main story concludes.
Con Requires a commited group to play and experience the full extent of the game
Pandemic: Legacy games are meant to be experienced over 12-24 games with the same players so that everyone involved can share in the overarching story of the game. Unfortunately, many gamers may struggle to find 2-4 players that can regularly meet up to play the game, making it difficult to finish the main story.