Effects are often incorporated into amplifiers and even some types of instruments. Electric guitar amplifiers typically have built-in reverb and distortion , while acoustic guitar and keyboard amplifiers tend to only have built-in reverb. Some acoustic instrument amplifiers have reverb, chorus, compression and equalization (bass and treble) effects. Vintage guitar amps (and their 2010-era reissued models) typically have tremolo and vibrato effects, and sometimes reverb. The Fender Bandmaster Reverb amp, for example, had built-in reverb and vibrato. Built-in effects may offer the user less control than standalone pedals or rackmounted units. For example, on some lower- to mid-priced bass amplifiers , the only control on the audio compression effect is a button or switch to turn it on or off, or a single knob. In contrast, a pedal or rackmounted unit would typically provide ratio, threshold and attack knobs and sometimes "soft knee" or other options to allow the user to control the compression.
Hi, sorry for my late reply. The Fender BJ has a typical Fender tone. Lots of headroom, mild mids scoop and a fairly bright tone. The Laney has more mids, a darker tone and less headroom, although it plays fairly clean on lower gain settings. The tone is closer to a Marshall/Hiwatt. So, it’s really two different sounding amps. For Gilmour’s tones, you could go either way, but I would perhaps recommend the Laney. It’s more versatile I think and it also works nicely with most pedals. None of these really need biasing but get matched pairs. Good luck with the project!