IAM
Emperor
I don't use accurracy. Typically I'll have a doxen cats in an attack stack. Half barrage half CR. I lose about 3 suicide cats on average in an attack. Cat losses are what ussually slow my advance the most.
Actually, siege weapons do get experience if they withdraw.
I'll put CR on Trebs, but cats get exclusively Barrage or Drill - and the Drill cats get barrage as soon as they get their first promotion.
It's not quite so clear cut IMO. If the city has a lot of homogeneous defenders (all same strength more or less), then sending a lot of collateral-promoted units through meat grinder makes sense. But if there are a few # of defenders, or a few that are much stronger than other units, then CR makes more sense IMO.Either you consider the unit expendable, or you don't. If you do, then collateral is the way to go. If not, then city raider, but that really only increases the survival odds from between slim and none to between not-quite-so-slim and none.
Definately CR, having that extra strength reduces the amount of dying cats, and that, in the long run, means less wasted and less WW.
Plus, if there is ONE strong defender (Lbow comes to mind), one suicide CR cat puts down his health atleast a bit. I have seen a longbow fend off 3-4 Barrage cats without taking damage. You're not very enthusiasthic when your cats are gone and odds still are <2%...
You could promote with CR and Barrage...
I'd choose a CR2 cat and a Barrage2 cat over two CR + Barrage cats.