title: Which is better H2 or HSQLDB?
body: <p>HSQLDB 2.0 is soon to be released. I wonder if it will outperform H2 since, as far as I know, most users prefer H2 than HSQLDB. I am interested in the MVCC support of HSQLDB 2.0. I have learned that MVCC on H2 is still experimental. With regards to support/documentation, concurrency, performance, which is better between the two?</p>