Vast difference in opinion from Orthondontist RT treatment plan

I am 51 & considering invisalign for cosmetic reasons. I have moderate crowding of my front teeth & a cross bite on an upper molar on both sides; not the farthest one back but the one before that. My bottom teeth are perfectly straight. My front bite is a little deep. I went to one Ortho last week who did my kids braces (and did a nice job) who told me that he could fix me up in 9 months in invisalign. I didn't get into too many particulars, mostly b/c I don't understand the mechanics of braces. The price was reasonable. He was an elite provider. Today I went to another elite provider & she indicated 16 months in invisalign & told me how she is one of the few experts in the area that can really dramtically change the cosmetic aspects of the smile. She said she takes it an extra notch. She said she could correct my bite issues & by doing some "angulation" of my front teeth, she could give me a nice wide smile & it would also give me a "face lift" and fill out my lips & cheeks. All of that sounded great. She said she get get rid of the black holes in my smile (which I didn't know I had) But then I got the price quote and there was a 2.5 K difference. Granted, the former Ortho was giving me a family discount as well as a professional discount. I would obviously prefer the dynamite smile, but much prefer the 1st guy's price tag. Would you recommend that I go back to the first ortho & see if he can offer me the same thing? How do I initiate this conversation with him? Does the time frame in invisalign drive the price? Also, you will see I have a molar that is a baby tooth with no permanent tooth underneath. Both seemed to think treatment would not hasten it's demise.