The RG1131PBU receiver is discontinued. It seems that JR now only make 6 and 8 channel receivers, with X-bus.
That RG1131BPU receiver has 11 channels and two power inputs.
In my opinion using Xbus is better than trying to use a receiver with lots of channels.
You probably don't really need 11 channels with Xbus because each channel function
(eg Aileron) can drive up to four servos. You could use either a 6 channel or 8 channel JR receiver with X-bus
and the limit is the number of channels on transmitter not receiver.
I found Xbus is very convenient and try to use it in all my models. You can use JR NX- type servos or
conventional PWM servos with a JR decoder.
With regard to the two separate power inputs on the RG1131BPU if that is an important feature
you are out of luck as that is not included on current JR receivers. If you want battery redundency
you may consider getting the 'XB2-CHB' hub.