Question regarding necron and crimson

[Imm0rtalLeaf]

So I'm currently using shadow assassin armor. I'm gonna get necron next, but what tier of crimson becomes better than necron? Hot? Burning? Fiery? I'll be using the crimson for anything outside dungeons, necron for inside.
And any specific attributes I should be looking for? I'll mainly do voidglooms.

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