There are several factors to weigh on, the following will be my viewpoint.
Lash Lift it's your natural lashes lifted kind of look. I have had clients over the years telling me, " I love exactly how I look naturally." Lash Lift is for you, every single strand of your natural lash is lifted from the roots, giving your eyes a pop. Clients have widened their eyes in excitement looking at how nice their lashes look lifted, you can even see the smile in their eyes. That's how good our lash lifts are. Lash lift requires 0 care for our salon, except for avoidance of direct heat. Heated eyelash curlers, hair dryers, etc.
Extensions on the other hand, yes it's well-loved, it's pretty, and once you did it, it sticks to you for life that kind of saying, you hear everywhere. I don't reject it as well, but as a lash artist, it is my job to inform you that lash extension are a lifestyle. There is a lot of cannot dos, and high maintenance.
You cannot rub your eyes even during sleep with extensions
High cost.
Need clean, need maintain, need dry, need comb, need a touchup.
It's with you, till you remove it.
Extensions are not for people with anxiety or who cannot handle stress well. (Something I realised over the years)
These are the main first 3 whenever a client asks me, I would have mentioned. If you are a person that would think that this 3 is a hassle or impossible, extensions is not for you. But if you belong to the group of being pretty is more important, extensions will be rewarding. It's still worth trying once in a lifetime, and some clients who think extensions are not for them still do them for events and festive seasons.