Which 4* at max signature level will help me the most?

spfspider

I mostly do AQ, EQ and am looking for the champion that will most helpful to get me through these and 4,5 & 6 in 5.2. My top champs are Blade unduped 4/55. Sparky duped 5/50 sig level 39. Dr. Voodoo 5/50 sig level 39. Archangel 5/50 sig level 60. Hyperion 5/50 sig level 39. Ghost Rider unduped 5/50. I don't run suicides, at least not yet. If you have any reasons why you would choose who you did, feel free to share. Thanks again all for your input.