Raintree is the most expensive of the two, very quiet and very beautiful. Residents seem to love the development. You can see more on my website (click on culver city condo's) Lakeside is more reasonable, and has a younger population with more families.
The turnover likely has to do with owners eventually moving to home purchase. Condo's are a common first step for first time buyers.
Email me for any specific other questions you might have.
Lakeside Village and Raintree have 24 hour security and are very safe. They are well maintained and quiet. They both have wonderful amenities. Let me know if you are interested in any of them. I have been working in these communities as well as Tara Hill for some time now. Approximately 25% of the community rent.
Let me know if you have any questions.