Each Shooting Star from Star Wrath causes 220 damage (according to the wiki), Meowmere causes 200 base damage
So, Star Wrath is 110 for swing and 3 stars causing 220 per swing
110 + 220 x 3 = 770 per swing
As for Meowmere, 200 damage per Swing and the cat bounces off 5 times
200 + 200 x 5 = 1200 per swing
But, a cat can't hit the same enemy 5 times (Except worms), only 2 or 3
200 + 400 = 600 or 200 + 600 = 800
So basically, Meowmere is perfect for Crowd Control and Star Wrath is for Crowd Control AND Bosses, besides it's really OP in PvP
So i stay With Star Wrath