I don't know the Brice, but I can comment on the Ibanez. Soundgears, including the entry level GSR's, are very comfortable and fairly compact instruments with thin and narrow necks. Reaching to the low B string with your right hand should be easy. Reaching down to the G string with your plucking hand is just a matter of moving your thumb and not sticking to one anchoring point. I think you'll do fine on a 5-string, I've seen people with small hands play some rediculous basses
Oh, by the way, the GSR205 has a regular 34" scale