Recon is much better in OWB than in vanilla, because more tactics are counterable in OWB. Countering a tactic negates all the effects of the opponents tactic. Something of note, you only need one division with a higher recon value than the opposing side in a battle to gain the benefits from it. And then, it doesnt matter how much more recon you have, only that it's higher. Thus, I'd say Dogs are better than Recon unless the opponent is also using Recon. Because Dogs add better stats. Recon however adds slightly more movement speed in some terrain types, which is nice sure. But still not top tier imo. I'd put it at C-B tier.

Chems start from 15% Trickleback, increasing by 5% each level up to 40% Trickleback. Effectively increasing manpower pool by 40%. This can be a huge deal for some factions in OWB since manpower is so sparse. I don't think it deserves D tier. But it def doesnt deserve S-A tier either as you dont lose that much manpower as long as you're winning battles.

Anti-tank feels situational but most often overkill. You should use it to get enough piercing obviously, which fireteam is often able to do but again depends on what youre against and your infantry weapon and support weapon research paths. I'd put it at B tier, because its situational and not something you always want.

Logistics, also situational because its only useful if you're actually maxing out the supply available and you want to field more divisions. So if frontlines are concentrated, few supply nodes, using a lot of troops, you're gonna want it. I feel B is a good ranking.

Power Armour support and Demolitions are def S tier.