Thinking about 2 x Watchmon vs 1 and different chemistries. I'm not sure 2 Watchmons are needed.
For me, I use Batrium (and the 84 longmons) primarily to monitor and throw shunt-trip is extreme conditions - e.g. an individual pack <3.1v and >4.15v. I don't use balance except for touch-up after 6 months or so - and its not needed on a daily basis for healthy cells! I operate in the 3.5v to 4.0v range for long life - don't get near the extremes and only do touch up balance once drifts to 100mv max difference- so 3.4 to 4.1 will still not hit the extremes.
Thinking about this... eventhough Gen1 and Gen2 might have different discharge curves and are in separate parallel batteries
1) Batrium will see / report each pack separately - which is no problem monitor wise if you know that 1-7 are a bit different discharge curve than 8-14 - there's no harm, its just info.
2) Batrium balance - you're not limited to 'top balance' you can use auto-level at various portions of the voltage curve. So I'm sure somewhere - top, middle, bottom - you can find a place to do touch-up (or initial) balancing, and then just turn it off. Balance is not needed for healthy packs on a regular basis!
3) Extreme / shunt-trip - assuming your operating in the long-life/powerrange', e.g. 4.1v to 3.4v, then even with different chemistries - its not clear that one Gen will hit the extremes of 3.0v and 4.2v (or whatever you choose) before the other... especially if you're using a long-life operating voltage range as I mention above.
In conclusion - I don't see the need for multiple Batriums even if the chemistry is different
Ofcourse it depends on 'how different' the voltage ranges are in practice- I'll be interested to hear about it once you get info and if you share - but really, they are both lithium-ion and shouldn't be wildly different?
P.S. I think we already covered mixing Gen1 and Gen2 parallel wise - so this post is limited to the idea that they are not mixed.