The Cirrus are known to be involved in many accidents while Diamond's safety record is exceptional.
Could that be due to very different marketing, not to mention a very different mission capability? An SR22 is a lot more capable compared to the DA40. In the USA, the SR22 is marketed as a saloon car replacement, to young well funded men. This is the only realistic way forward in GA these days, but it will attract a higher % of pilots who think they are invincible.
Compare the insurance for both of them. If you are a low time pilot you might not even get an offer for a Cirrus to be insured.
Is that true in the UK as well, once you adjust for the big difference in hull value?