I have omega,corvus and warlock all of them at r5. I don't run suicides and when I play with omega and Corvus I feel the need of having suicides. With Corvus I can get around this but with omega it just doesn't feel great. With warlock it just doesn't matter if you have suicides or not.
Not even one of them is slightly worse than the other. They're all just as good and have a ton of utility as well as fantastic damage. So, yeah, go for the champion that you think you need the most and will benifit your account the most. The only reason I voted for Corvus is because, honestly, I'm just biased and want my homie Curvus to have as many votes as possible.
Given it's your one of the first few rank fives, warlock will help you more both in long term and short term content. G2099 will start to shine in a bit longer piece of content.
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Without suicides g99 prob needs it least. The others all require r5 for damage in act 6/7 imo.