I opted for Bio Sculpture and you are right, it's been insanely expensive!
In spite of the cost I went for it for these reasons:
Nobody else was offering it for quite some distance from me so not much competition.
It's very kind to nails, vegan, ethical and 5 free.
It has an excellent pedigree.
It's not made available to anyone except trained Bio Sculpture technicians. There are some limited products being sold by third party sellers on Amazon and eBay but they're massively overpriced.
I think they have a good colour selection. Between Bio pots and Evo gels you have a LOT to choose from.
Ironically I seem to spend more of my time applying acrylics as they tick the strength box which Leanejayne mentioned! [emoji23]
However I'm not sorry with my choice because for the ladies who want gel I've found Bio Sculpture easy to sell, particularly with those who want to try something other than Shellac which is hard to get away from around here. Once tried I usually get returning custom. That said I might have experienced much the same by offering another brand.
For mobile teching it's great, I can get the lamp, tools, files, wipes, fluids, gels, aftercare leaflets, pop sticks and other paraphernalia all into a 16 x 12 inch case and carry about 70 colours.