You didn't specify the set was for Impact
No I didn't! Granted that my sets for Impact and the rest are pretty much the same, because of inventory restraint.
Anyway you and Nariont said STP+4 on the neck wouldn't really change much, so SB+10 is better. Well, SB is undoubtely nice, but the first part isn't exactly true, at least with my numbers. Which might be slightly different from yours because atm I'm not using BiS gear.
I'm tryin to use gear that can be shared by both GEO and RDM. I could augment Merlinic Head/Body with OA but not now, maybe in the near future.
But I digress!
Here is the data I gathered. First numbers are with the STP+4 neck, the ones in bracket are with Bathy Choker +1 (i.e. 4 less STP).
GEO
Impact: 1046 (1014)
Thundara3: 748 (725)
RDM
Impact: 1110 (1078)
Thunder5: 580 (565)
Blizzard5: 506 (493)
Now of course you want to know more data about how I obtained those numbers, here are the values:
Geo STP: 31
Geo OA: 120
RDM STP1: 58
RDM STP2: 39
RDM OA: 120
RDM has 2 STP values because one is used for impact (Head/Body locked) the other is used for the rest. On GEO I don't have this choice because there's no STP head/body, RDM gets Malignance.
On GEO I'm using Null Shawl instead of JSE cape.
Also for both jobs I'm using Dignitary (3STP) instead of Dedition (8STP) because it's muled.
RDM could get even more STP on neck, Anu Torque 7, Ainia 8.
But I have both of those muled so, again, inventory saving for old Sechs!
I do own Bathy Choker +1 btw and it's not even muled, I use it for a couple of Evasion sets.
But I think I'm gonna stay with my STP+4 neck on my OA sets for now.