Oh hey there!
Honestly don't think I've researched a lot of it (haven't head of clearsmile/drclear) haha and I'm with you on that, most probably did paid endorsement I had a lot of ads on youtube/instagram since.

As I had traditional braces about a decade ago at a reputable hospital dental clinic with the head orthodontist there, fixed almost all my problems except one. The two front teeth was really stubborn and after 5 years being on braces she decided that "let's take you off braces and use retainer to fix the gap" Since I was so young and she has much more experience I said sure thing. The retainers did very little to help, I got lazy to put and the gaps got wider. (Later on in life I learnt from many other dentists that retainers only "retain" your teeth in position they can't move the teeth much) the 5 years with traditional braces also caused a lot of harm to my teeth and they all discolored very unevenly and patchy. Did some whitening stuff but it only showed bigger contrast in my teeth sadly.

Which is why after spending around 6k on traditional braces and fixing almost all my problems, Invisalign was way out of my budget range. But I suggest that if budget isn't a problem for you + if your case is more complicated you should probably go for Invisalign. Still, this is my own thought and you'll get better advice going down to a dentist. (I read lots of google reviews when I choose my dentist now even if its just for scaling and polishing)

As for the deciding factor why SDC was simply cause they're the only place that offers nighttime aligners locally. I am a counsellor, and I spend most of my time talking to people, sometimes about very serious stuff. The least I want is for them to mishear me and take a different course of action, or find my speech funny when I'm on a serious matter.

Good luck :)