I am going to say that online casinos have better jobs because they have a much smaller overhead. Less employees, less rent, less electricity costs, and likely they are incorporated in a country with less taxes and regulation. Physical casinos would have to charge higher fees or be significantly less profitable.
To add to it, every online casino seems to have a means for just anyone at anytime to verify if a gamble is fair and their are people or groups that takes these seriously and given the much competitors out there, they are always about giving nothing short of the best of services and bonuses to make them stand out. Physical casinos don’t give much about that and they’ve got more cost than the online casino which would reflect on how fair and what odds they provide to maximize profit.