shellac is a power polish - like long lasting nail polish, cannot be used with tips but can over enhancements - is better used on short nails and nails that are in good condition - quicker to apply and soaks off in 10
gelish is a gel polish - like gel but in a bottle - long lasting polish with a bit more strength
bio sculpture is a soak off gel, can be used as overlays, with tips or can be used to sculpt enhancements - strong but flexible - takes around an hour or so, soaks off in 20 - comes in a pot not a bottle
all these products are good and be used in unison with each other to provide clients with treatments specific to them x