As Chris has said there is a pretty big difference. If you are just looking for changes of on/off or x/y state changes of the overall effects/amp/cab chain of a preset then scenes are great. If you are looking to completely bring in/out different effects, amps, etc...then changing presets is likely the better consideration.
Separately, the functions you are referring to above are totally different Sticky Preset keeps you statically in a bank and each of the 8 switches is a different preset. Sticky scene keeps you statically in a single preset, allowing you to access the 8 scenes within that preset.
Again, in agreement with Chris the only way you can decide is to fully understand the limitations of scenes relative to full presets. If scenes get you where you want to go, its far more efficient, when you consider each preset = 8 scenes