SQL Server Embedded Edition vs SQLite

Can anybody shed some light on how these SQL products compare? No need for essays, only highlights such as "X supports this, while Y doesn't". - How is efficiency affected as the database grows larger - Inserts - Updates - Selects - What kind of transactions are supported - What support is there for multiprocessing - Access from concurrent *processes* - Access from concurrent *threads* - Data access is in-process or via server process - Key feature of either product that is worth mentioning Also, any (positive or negative) experiences from people who have used *both* products (don't want opinions - just observations). The reason I'm asking is that it's hard to penetrate the marketing fluff surrounding Microsoft's embedded SQL product. Thank you.