Give me down low on soccer clubs in San Diego?

Family is relocating from the Bay to San Diego due to my work.

Looking to get information on competitive soccer clubs in the San Diego area. 4 kids,

- Oldest is a girl, who plays u15 comp soccer but not super serious.

- Middle and 2nd youngest play mld-next or in Youngers case, pre-mls-next team.

- 4th is a little turd u7.

Ultimately they may end up at different clusters but trying to understand the different dynamics at the clubs including the 87 variations of surf down there.