All the specs are very similar on the Futaba S148, S3003, S3004 and the Hitec HS-425BB. The S148 is called a Precision servo while the S3003 is called a Standard servo, yet the specs are essentially identical. Same specs essentially for the S3004 and the HS-425BB.

I realize the BB servos should be a little better under load, but would appreciate your input using these models as I plan to buy some flight packs pretty soon.

Thanks