COC and Beach boom both are from the same studio supercell. Supercell is known for creating high end simulation games. But when it comes to choosing between clash of clans and beach boom the fight becomes quiet tough. Coz both games are on same genre and having the same theme.
The only difference is in army character and mode of attack. Beach boom has lot of excitement as compare to clash of clans. Ships are the carriers for your troops unlike direct tapping method in COC.training method is same in both games but to accommodate more troops you need to buy boat or upgrade the current boat to accommodate more troops or to have upgraded troops.in clash of clash you need to upgrade and add extra battlefield to train your troops. Coming to graphics both games have quiet similar graphics since both are from the same studio but graphics in beach boom seams to have a little edge as compare to clash of clans. The waterfall and water waves graphics make beach boom looks more realistic and graphics rich.both games run smoothly on any device having minimum 1 GB RAM.
at last we see that both games very similar in terms of gameplay. The only thing in which beach boom has an upper edge is graphics. And a lot more depends on user choice as well.