Here is my actual choice for pact infantry in my deck, i would gladly receive any comments or advices about it.
Rifle squad : motostrelki + BTR. I know it's an average combination. For me the role of the rifle squads is to be numerous and cheap with the capability to hold their ground. They are front line holders. I usually take them wirh the cheapest BTR and VET 2. Availability is great with 40 squads available. At 22 points, they remain rather cheap (only 2 points more then the majority of NATO rifle squads usual combination of troops and transport). The VET 2 improve greatly their efficiency giving them very good accuracy (8-9-12), boosted morale (better rate of fire ? I'm not sure if it's a benefit of veterancy). Additonal bonus to the accuracy of the BTR HMG. This VET thing, good idea or not ?
Shock troops : choice is more difficult here. Spades with their fast transport and cheap overall price could be an asset. But I usually go with the mot-schutzen with the BMP1-SP2 (i would love to be able to put these guys in BMP2 serie

). Not cheap, but a powerful combination able to provide a good support to hot points.
Special forces : 4VPZU + skots. Reconnaissance, infiltration. They are costlier than the grenzers but with far better stats and faster transports for recon duties. Due to their fast transport, they are able to establish first presence on the frontline at the beginning until the motostrelki in their slow APC arrive. I'm not very good at using transport helicopters and as such, don't take slots on my deck for airborne units. Moreover, I rarelly use more than 2 of them when I try. I often send land infiltration groups where I can cover every threat. But sometime, when I feel the necessity for airlift, I buy 2 MI24, 2 4VPZU; get them out of their skots and put them in the helis, and go rampaging behind enemy lines. i find it a better usage of my infantry slots taking advantage of the capacity of combat helis to carry troops.
Heavy shock troops : spetsnaz + BTR70 ( nothing is too good for them). Essential to every pact deck, me think, except maybe when we will have Wargame : middle east escalation and flat desert maps

. They are the gods of the woods and infantry combat. Honestly, I use them more often than the mot schutzen for support of the motostrelki and switch to mot-schutzen when they are spent. I guess I should try to use in different roles (support vs assault) but which one for which role ?
I would tend to say, mot shutzen for assault thanks to their BMP (resilience, AT capacity, more expendable than the Spetsnaz) and spestnaz for support (average transport but fast for quicker support, motostrelki provides AT capacity). What do you think ?
ATGM squad : PTUR konkurs, nothing special, Konkurs have greater edge now on the Fagot teams due to the increased range of heavy armor equal the the one of the fagot. With this increase, if the ATGM become more situational to use. i might consider switching them for something else : motostrelci for suicide run to enemy tanks, grenzers to spare 4VPZU of recon duties, spados for agressive push of the frontline. Ideas ?
As said earlier by DeuZerre, that's only my opinion, feel free to disagree.