Turbostart Battery

I've had a Turbostart Collectors Series battery S24MY on order for some time and after talking with them there is no definitive time line on when they will ship. I was offered an available version in the Light Weight Collectors Series BB-S24MY that can ship in a week. From what I understand the S24MY is a fully manufactured battery where the BB-S24MY is a shell with a AGM battery inside of it? Anyone have any experience with either of these batteries?

S24MY – Turbostart
BB-S24MY
BCI Group 24
CA: 640A
CCA: 560A
RC: 59min
31lbs

BB-S24MY – Turbostart
S24MY
BCI Group 24
CA: 690A
CCA: 550A
RC: 100min
42lbs