Personally, if you want to do more than, "Oh hey, shoot me and my personal guards of knights!" I would personally equip a 10-man squad full of shooting (Beliel having his default wargear+8 other storm bolters, 2 assault cannons, and maybe 1-2 chain fists in the worse case for going against walkers.)
Its up to you if you want knights vs terminators. Knights are pretty nice for having T5 that isn't high strength and/or blast/large blast/template. the B2B also helps Beliel against anything but Str 10/Force Weapons actually being unsaved.
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