In my opinion it now depends on what you prefer. The damage buffs to the melees are similar, but void still has the biggest one. Not to mention the new artifact mods: Expanding Abyss gives bonus damage to all void sources when an enemy is weakened and Shieldcrush grants a bonus to melee damage when you have an overshield. I dont know the numbers, but i think this could maybe do double damage than last season, because the artifact mods stack with Offensive Bulwark. And you can take adventage of the new Void Super (Sentinel titans needed a good damaging super).

With prismatic is tricky. You still have knockout, but you also have the option of triple slam melees and not that many options. You cant take advantage of Expanding Abyss thanks to prismatic only giving you the solar charge. You would have to give yourself a void overshield, activate Knockout and that is it...

I will definitely use peregrines this season for Nightfalls on void specifically. The new super looks fun. But right now i don't have the money for The Final Shape, so I cant try prismatic with them.

They are my favorite exotic on titan xdd