Why is choosing an r4 so hard?

Alright, I've finished EOP and pulled a tech gem, which I used on Ironheart.
I've narrowed R4 number 2 down to these 4 contenders, and would love to hear the arguments for one over the others.
I feel like Onslaught is a 'duh' choice with his all-around utility and damage, but all of these bring serious juice in their own right.
I'm moderately engaged in BGs (usually URU I/Gamma IV) and am more focused on endgame content as it comes out.

I've narrowed R4 number 2 down to these 4 contenders, and would love to hear the arguments for one over the others.
I feel like Onslaught is a 'duh' choice with his all-around utility and damage, but all of these bring serious juice in their own right.
I'm moderately engaged in BGs (usually URU I/Gamma IV) and am more focused on endgame content as it comes out.


Why is choosing an r4 so hard? 68 votes
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Onslaught or DThanos