i feel you've asked this several times recently
most people use Presets (Patches) for different songs or "sound sets" - meaning that the Preset contains all the options. songs are self-explanitory. but let's say you have a "alternative rock" preset with certain amps and effects, then you have a "metal" preset with different amps, cabs, effects, then a "jazz" preset, and so on.
at your gig, instead of changing presets song to song, it's more about the type of song it is. and these 3 presets that i just mentioned were all auditioned in rehearsal and mixed with your band and their instruments and tones. now you have options for different sounds, rather than having specific sounds per song, and this will go a long, long way.
most audience members can discern clean and distortion - that's it. boogie vs marshall vs low gain vs high gain... they barely can tell. an effect, perhaps, can be discerned as well, but they usually don't know a phaser from a chorus, they just know "something" is happening in the song. this is advantageous to us as musicians
anyway, within the Preset, you can create Scenes. just think of Scenes as "pressing several buttons at the same time." turn chorus and delay on in Scene 2. turn on drive and reverb in Scene 3. Scene 1 is dry - all effects turn off. this lets you keep your base "alt rock" tone, yet change many things with 8 available Scenes.
i do all my gigs with one Preset. i use 5 Scenes primarily, sometimes 6. this is pretty much outlined in that video i posted in one of your other recent threads, though it's changed a bit recently:
S1 - Clean Detune sound - clean amp, pitch detune - optional Dot 1/8 delay, drive, multidelay, etc
S2 - Clean Lead - clean amp, GEQ for boost, lead delay
S3 - Multidelay "verb" - clean amp with long diffused delay for slow passages
S4 - Ruckus drive - clean amp with drive on
S5 - High gain tone - high gain amp
S6 - High gain lead - high gain amp, GEQ block for boost, lead delay
throughout the gig, i just change Scenes since all the tones i need are there. i have other effects that i turn on with their own on/off switches.
that's really all there is to it. it's not "Presets vs Scenes" - they aren't separate, they work together.
can you elaborate on what may be confusing, or what you don't get, or is it a setup thing? Scenes just turn on or off multiple things - do you ever need to do that during the gig?