In reply to BnB: FWIW I'd say they are all too large for summer use and I'd prefer not to actually climb with any of them. I'd say something like the POD Alpine 30 or Blue Ice 30l Climbing Pack could be better, if not something even smaller/lighter like the Blue Ice Warthog 26.
That said for Winter use, 45litres is a reasonable size. You can certainly get away with smaller sacs but for longer walk-ins, a bigger sac tends to carry the weight better. The ones you have shortlisted are all decent sacs but none of the 3 stands out as being markedly better or worse than the other.
There are literally dozens of options on the market so you are pretty much spoiled for choice, but don't expect there to be any real consensus on here about which one to go for.
I replaced an old Black Ice with an Alpine 50 and I wouldn't go back, although the Alpine 50 is probably not as utterly indestructible and has a stupidly expensive SRP (I bought mine fairly cheap 2nd hand).
I'd probably look at the Osprey Mutant 38 (42litres in long back length) and BD Speed 40. I'd also be fairly keen to have a closer look at the Blue Ice Warthog 38 if I was focused on minimal weight. Finally, as a budget option there is the Berghuas Arete 45.
And that is without mentioning Macpac, Aiguille, Deuter, Arc'teryx, Grivel, Mammut ...
As I said, don't expect any real consensus.