I think the real difference is that with Shellac there is no need for any buffing at all. None to prepare the nail and none needed for removal.
Shellac is described as a power polish, on like polish and wears like gel, off in 10 min.
The others are described as gel polishes that paint on like a polish, off in 10 or 15.
From reading all the threads on here, Shellac and Gelish get the most ratings.
Shellac has no buffing of the NN and endless laying combinations as well as glitter effects. CND has a very good name and along with the advertising they have done to promote Shellac has made clients aware of it therefore they ask for it by name.
Gelish gets rave reviews on here also as they have some beautiful colours available. But Gelish does require the NN to be buffed (shine to be removed), and you need to buff the shine off the Gelish when it comes to removing also (not needed with Shellac). Some NN clients wouldn't like the buffing of the NN prior to application and I know I didn't when I had Gelish put on.
I asked the tech to only buff one hand so I could see if it would last without the buffing but she wouldn't do it.
I do have a damaged thumb nail at the moment so I had the Gelish placed only on the not damaged part and there was no buffing on that thumb and the Gelish came off a few days later but lasted a few weeks on the buffed fingers.
I haven't yet used either of them on clients.
I have looked into both systems.
I am doing the Shellac course on Monday and have bought two of their colours and have to say they look absolutely beautiful (in their bottle
) but can't use them yet as I don't have the CND lamp yet.
I have tried Gelish and that was great too. It was super easy to remove and as said earlier lasted a few weeks.
I was going to try Shellac next but as it would only cost me a little more to do the course than to have it applied, I decided to do the course.
And I'm swayed more toward Shellac for the no buffing required.
I think from memory Shellac says they are a 2 week lasting high shine polish and Gelish 3 weeks???
But I'm sure someone will be along to correct me if I've got that wrong.
I think the only way to decide for yourself is to try them all and see which you like yourself and what works for you.
Personally I cannot sell anything I don't believe in (would never have made a good used car salesperson!).
So I need to love the product I'm selling.
Good luck