In your situation (2 new champs), CapIW. I have both CapIW and Guardian at high sig, but CapIW has done so much for me, he would be a clear choice for me.
However on my acc, I'd pick guardian for extra sigs.
Look, both CAIW and Guardian are good choices, you can't go wrong with either. However , they both NEED MAX SIG ( not even just "highish sig" , nope you do need all 200 levels) in order for them to really shine and give you their full utility. Unduped though, CAIW has the edge in terms of survivability (highest Block Prof in the game) and damage. Mind you, Guardian is no slouch in neither of these categories ehile unduped, but for example, although damage-wise has he a higher potential than CAIW, he needs a long and grueling ramp up for it, and doesnt have CAIW-like block prof or glancing mechanic to survive the chip damage to stay alive till reaching such levels of damage. CAIW on the hand does and if you want big yellow numbers all you have to do is get 5 shield charges, parry heavy (if possible) and throw and sp2 and BOOM! Most fights would be over at this point .
I would know, I have them both as 5* R5 max sig. I use them both together in the same team usually and they rock. In fact they are both staples on my team, amongst my most used champs.If neither of them would be duped I know CAIW would most likely get picked over Guardian. Both max sig though then they both get picked equally.
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However on my acc, I'd pick guardian for extra sigs.
I would know, I have them both as 5* R5 max sig. I use them both together in the same team usually and they rock. In fact they are both staples on my team, amongst my most used champs.If neither of them would be duped I know CAIW would most likely get picked over Guardian. Both max sig though then they both get picked equally.
You should take CAIW, he's got so much utility.
If it were my case, I would had taken Guardian. I have both of them duped and I need sigs on my Guardian.