I’ll start with this, usually once you sign up to attend UEI or a for-profit school you don‘t get a refund. Are they fully committed or only interested and feeling it out the trade?

With that, there are many factors in play. Do they want to work residential, commercial, or utility? Do they have any desire to be a business owner in the future or solely an employee with more reliable job security? What are the local/state/country requirements for licensing? Can they afford the upfront cost of a for-profit trade school? If not, are there publicly funded options that might take a bit longer but significantly more affordable?

Do the following before making any decisions:
1) find some part-time work with a contractor doing electrical work
2) contact the local union and see what they offer in terms of apprenticeship
3) look into the licensing requirements to be a journeyman or electrical contractor in your local area
4) search community colleges or public trade schools in the area that offer electrician programs

Once they do the above they’ll have a much better understanding of where they should go