I’ve owned a THR10 in the past and currently own a PJB Double Four. As far as handling bass, the PJB wins as it’s been designed from the ground up as a bass amp and will deliver a deeper fuller sound with more volume, all the way down to the low B. The THR10, while lovely, is a guitar amp first and a bass amp second. The THR does have amp modelling, built in effects, a tuner and a USB Audio interface though which may be something to consider.
If you have effects/preamp pedals then get the Double Four and don’t look back. Equally, if you play 5 string or use octavers the Double Four is by far the better option. The Double Four could handle low volume acoustic jams with greater authority. If none of the above applies to you then the decision isn’t so clear cut.