Hello. Are you talking about a ‘span’ bandwidth or a demodulator bandwidth? With the SDRPlay range and using SDRUno software, the widest demodulated bw available is 250 kHz, which is more than wide enough for broadcast FM, and which is the widest bw you are likely to come across (except for specialised modes like TV). The maximum bw available as a span on the screen is 10 MHz.
I wonder what this ‘other brand’ of SDR is? If it’s something like the Funcube Dongle I believe the max span is 250 kHz, so that’ll set the max demodulated bw as well.