I'd do sidious as he'd benefit more from zader with him being able to add 2-4 DoTs on each character, and gaining the offence boost and turn meter removal of Vader
You may sub them out on offense depending on who you are facing. But Sid will certainly add more dots. If you have a taunt you want to get around, or just abilities you want to block, you could use Boba.
As far as the zeta, I'd give it to Sid first. Boba's is nice, but I don't think it's really game changing.
Definitely Sidious !
I'm having success (top 10 of my shard) with Zader Zidious TFP Boba Nihilus. All modded for minimum +60 speed. Can beat Zaul team and Rex team if Boba (very fast) can ability block Rex ! http://swgoh.gg/u/okonomiyakiparty
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As far as the zeta, I'd give it to Sid first. Boba's is nice, but I don't think it's really game changing.
I'm having success (top 10 of my shard) with Zader Zidious TFP Boba Nihilus. All modded for minimum +60 speed. Can beat Zaul team and Rex team if Boba (very fast) can ability block Rex !
http://swgoh.gg/u/okonomiyakiparty