Wouldn’t Europa be a better fit for colonization than Mars ?

Edit : This has received much more attention than I thought it would ! Anyway, thanks for all the amazing responses. My first ignorant thought was : Mars is a desert, Europa is a freaking ball of water, plus it has a lot more chances to inhabit life already, how hard could it be to drill ice caves and survive out there ? But yes, I wasn’t realizing the distance or the radiations could be such an issue. Thanks for educating me people !