ASP and/or JSP are much better/faster
Actually, I think this is more of a "preference" choice rather than ASP/JSP being "Much better/faster".
Most of the great open source/free shopping carts (cubecart, oscommerce,zencart, etc) run on PHP/perl/cgi/mysql. I think most of the carts I've seen run on php/mysql.
ASP is a microsoft windows based programming solution. She will probably recommend that if that's what she's more familiar with.
If you decide "not" to use her to make your site, I think you'll have an easier time finding php/mysql programmers to work on your site than ASP/JSP. Php is also not too hard to pick up on when you need to edit something.
I use shopsite pro on one of my sites and it is very good shopping cart software. But that's available at pair as well as verio. Both hosts have been around and established for a long time.
Again, it's just a matter of preference really. But I personally would go with a php/mysql based solution rather than an ASP based one.
If you plan to always be totally "hands off" in the site development, then it probably doesn't matter too much as long as your site works
