I much prefer mindfulness, to me it just seems more respectful. Some studies have shown that CBT which focuses on getting rid of a negative thought with logic, can actually increase those kinds of thoughts, whereas mindfulness goes ''ok, I feel negative, that's how I feel today'' and then there are strategies for dealing with feeling negative, rather than trying to talk yourself out of it. Kind of like what would happen if you were just ok with having a crappy day, rather than focusing on what didn't get done etc.

Another mindfulness strategy is 'it's just a thought' like, when you're catastrophising about something it can be really helpful to remember that it can't hurt you, it's just a thought. You're not trying to get rid of it, you're acknowledging it while hopefully noting that it doesn't have any actual power.

I haven't done any professional mindfulness counselling in a couple of years, so things may have changed, but back then the psych industry was all about positive psychology and CBT was a bit out of vogue. I think more studies will go to show how awesome mindfulness is. However, it all comes down to if it's the right fit for you!