I’ve been sitting on a 6* Tech AG for about 6 months now, and am ready to pull the trigger. Here is my tech roster:

My original plan had been to dupe Nimrod, but managed to do so naturally via the Featured gem (thanks Kabam and RNG gods). I then decided that I was going to use it on Ultron as he does get some solid benefit from it and he is my other R3. I’m NOT going to invest in Ghost - even if I get her at 6* - as I’ve already got her as a 5* and don’t play her enough to justify the investment. I similarly not sure I’m going to do so if I ever get Guardian, although I do play him a lot more.
The only thing that help me up from pulling the Ultron trigger was that I knew I was about to finish Chapter 7.1 exploration and might dupe him naturally. I didn’t, but I DID pull Peni Parker, who I immediately took to R2 and who will most likely be my next Tech R3.
So, my question now is: Use it on Ultron or instead use it on Peni? Based on my research to date, it seems that Ultron benefits more generally from the sig ability. However, it seems that one of Peni’s more interesting pieces of utility - being able to shut down certain types of healing at key moments - like when NF’s LMD gets destroyed - is trapped behind her sig ability.
Interested in the communities input and thoughts on this - stick with my Ultron plan or go with Peni?
One final piece of info: I can probably only ramp up whoever I awaken to a sig level of 20 initially.