I see you have chosen the wrong side(con) but I realize you are for it(pro) and I will be the one against it.
Clash of Clans is better because it generally gets better reviews.
Clash of Clans: Metacritic: 74/100 Touch Arcade: 4/5
Boom Beach: Metacritic : 69/100 Touch Arcade: 3.5/5
Clash of Clans also has more active players playing than Boom Beach which means more people to interact with.
Sorry, realized my mistake when it was too late. When you said Clash had more players and has a higher rating, you are right, but remember Boom Beach is newer than Clash by about two years. Think how much things can change in two years in the gaming world! Boom Beach is already in the top 10 grossing in the App Store-and the game came out only in late March!!! Remember when Clash of Clans came out, it took months for it to become popular. Boom Beach is already popular, but that really isn't an argument since people now know what Supercell is now. The game itself now, I like how their isn't walls in Boom Beach. Think about the time dedicated to move the walls into place. If you are a high ranked player, think about how much you'll have to try to perfect the walls while in Boom Beach their isn't! Instead Boom Beach focuses solely on the weapons themselves and that doesn't cause lots of time. your turn
Alright. By switching its focus primarily to weapons, Boom Beach therefore removes one of its core gameplay. Making the experience less diverse. Castle of Clans arguably has a better universe by its middle earth type setting. With different races and such the experience is more rich. Preparing to fight a group of goblins is considerably different than towards another race. You don't feel this while playing Boom Beach.
You can also argue about that with Boom Beach too. The setting is around a group of archipelagos. You also go to players islands' and loot gold. This gives you a "pirate" like environment in Boom Beach. The pirates of real life would set up bases on islands to claim it their fortresses. The part where you loot their resources gives it more of a pirate like environment. That was what I immediately thought of when I first played this game. Now on to builders. When a person who is trying out Boom Beach that has played Clash of Clans see that their is only one builder, he probably thinks the wait time is going to take forever. That isn't the case. The times are significantly shorter in Boom while in Clash you have to wait from days to weeks on one project! I am talking about the town hall in this case. The highest HQ level in Boom Beach only takes two days to complete! Then their are the options on buying builders in Clash of Clans. Many stockpile their gems to get a third, fourth, and fifth builders hut. That doesn't leave a lot of room to use gems on anything else in Clash unless if you are willing to spend real money. In Boom Beach, you can use gems on anything you want. Use it all or save them for bigger projects. Also the game is really generous when it comes to gems. You can find them on your map DAILY GUARANTEED! If you commit yourself to saving gems, you'll end up having a lot without spending any real money, while in Clash you have to rely on completing missions, finding them by clearing obstacles, and gem boxes. Maybe you can get gems another way. Forgot. Anyway, if you can get lucky in Boom Beach, you can get 15 gems in one chest on the map versus a gem box on average 2-5 days!