The only important thing, that will make one unit better than the other, is the ADS/APS. The one that will have a better unit will be the winner.
For every measure there is a countermeasure.
Relying on an APS to make your vehicle safe is very risky... what happens if someone develops a cheap and simple way to defeat your APS?
A laser jammer or dazzler, or decoy system or whatever... all of a sudden you are vulnerable again.
The other thing is that all of the new vehicles will likely get a standardised APS system... and that includes older models still in use no doubt, so suggesting that the new vehicles will be better than the old ones because of their new APS systems seems a bit moot.
At the end of the day an APS is just one extra layer of self defence that adds to the protection of the vehicle and its crew.
The lighter vehicles will rely more on APS than the heavier vehicles so that they can be lighter and more mobile so they will likely be more important on the Kurg and Boomerang than the armata.
I guess 57mm for the IFV and 45mm for the APC. Do we have any info about the ADS? Is it the new system?
I very much doubt they will adopt both new calibres... too expensive... and no obvious pay off. It would be like the US adopting a 30mm cannon and a 25mm cannon for its Bradleys and Strykers.
A 57mm or a 45mm would be suitable for an IFV that needs to be able to hit air and ground targets that are either soft or hard. Both have the velocity and rate of fire advantages of a 30mm but with more HE power and therefore could be used to replace it with a margin of improvement in terms of range and penetration.
The addition of Kornet-EM missiles would further improve the armament package and allow a range of targets to be engaged at extended distances.
An APC just delivers troops and might provide fire support but is not really optimised for engaging the enemy equivalent vehicle type except perhaps with missiles like Kornet-EM. As such the APC can get away with HMG or light cannon armament (I would go for either the 14.5mm KPV or 23mm KPB as a compact but still powerful weapon for use against ground targets) and Kornet-EM for range and use against hard ground and also aerial targets.
An IFV needs to fight enemy light and medium armour and defend itself from enemy heavy armour so a 57mm or 45mm gun plus Kornet-EM would be an ideal weapon combination.