Next, as a guitarist who regularly uses pedals, I frequently see amps on stage that are not at all pedal friendly.
Some amps don't even have an effects loop (or "FX loops," as some would call them. If you see "Send" and "Return" holes behind the amp, that's the one!) to plug my pedals in through. If this is the case, you'll have to run them into the front or input of your amp and hope for the best, which I hate if that situation happens to me. This is crucial for me because plugging in my multieffects pedal straight into the input of the amp will often result in horrible guitar tones that will come out of the speakers because there's already a preamp section in my multieffects pedal, so if using my preamp section in the pedal going through the amp's preamp section just doesn't make sense to me. So in order to combat this problem, most amp manufacturers provide the effects loop jacks at the back of the amp so that your pedals will bypass the amp's preamp section and hence sound more organic, more like how the pedal are supposed to sound.
And lastly, when I see the amp heads and the cabinets oddly paired, I know for sure I won't like how they will sound when they are played.
Think of it this way; You want to play metal music, but you see a 100-watt high gain amp head being paired with a 2x12" speaker cabinet that is meant to play mainly cleaner kinds of guitar tones, like a VOX speaker cab with Celestion G12M Greenback speakers... You know where this is going, right?
Most gig venue owners will use whatever amps or cabinets they have available for guitarists to use because, let's face it, we're not Joe Bonamassa or Kirk Hammett, who can simply demand which amp and speaker combo we want to use on stage. Although it would be cool and fun to just mix and match amp heads and cabs and see how it sounds, I would rather save that for the recording studio to experiment with and instead focus primarily on performing because most of the time I already know my guitar tone 99.9% of the time, so figuring out how to achieve my sound from weird amp combos would defeat the purpose of me trying to save time setting up and soundchecking.
Now, if you're a guitarist like me and dissatisfied with the guitar amplifiers you must use at gig venues, then, my friend, you need a guitar amp head! You should definitely check out my top 3 amp heads, which I'll now show you.