Reaching TH15 after CWL, Who to Replace For DD?

I'm primarily a ground attacker and my current line up is
BK - EQ Boots and Spiky Ball
AQ - Magic Mirror and Action Figure
GW - Fireball and Rage Gem
RC - Electro Boots and Rocket Spear
MP - Default Equipment

With the new equipment event, I'm torn to either buy the new DD Rocket or Snake Bracelet to help my BK funnel, though if DD becomes too good to pass up, who do I swap out of the main attack strat with the new equipment in mind? I also heard the stun blaster might outpace the rocket once I'm reaching higher TH levels.