The Bat is a terrific amplifier, I would look at your cables, power conditioning, room tuning etc.
You may want to check out a good preamplifier, most dac's driving an amplifier directly don't actually sound as good.
It's a great question but unfortunately I doubt you are going to get any truly educated answers. I don't think there are many guys on here that have actually heard the 260 and if they have most likely not in their system. Then...of those guys, how many have also heard that particular BAT with your speakers etc. You may get some input from guys that have heard Spectral gear before (which will help you not at all) and BAT gear before...and some that have heard neither (you'll never know!)....so, that's a tough one!
I know the 260 but not that BAT so other than rave about the new Spectral stuff I won't even be of much help....