I have smelled some of them in store only, so I don't have a big experience. They seem the same formula. As oils, one doesn't get the big initial oomph, but they seem to smell more or less the same after that. I don't know which one is more expensive per unit of aromachemical, but the oil vials are rather small, so i suspect the alcohol perfumes, while expensive, are relatively cheaper.
(Le Labo has also bath oils, which I love. As a functional product, they are long lasting, but I think they are very diluted and not intended to last. they still smell the same, though, so I think the underlying formula is the same).