Onyx Blaster or Mega Shark against Plantera?

[Aiden L]

I'm playing on an expert world and I have both the onyx blaster and the Mega Shark. The next boss to fight is Plantera, but which should I use? And what bullets with it?

 

[ppowersteef]

My vote would actually go for Chlorophyte Shotbow and Holy Arrows.

If I had to choose between the two. I'd prefer the Megaschark so I can focus less on timed shooting and more on dodging.