should we do a retail site or 8th fl of a building?

My wife and I are just a couple months away from opening if things work out. We have just a few details to confirm before we start deciding on a location. We're opening an aesthetic practice doing botox, lasers and other skin rejuvenation stuff. We're teaming up with a Dr who won't be on site but will be there at least one a week while we run our business. He currently has some space available in his own practice he offered to share with us. It's an amazing location but on the 8th floor of a building. We're debating whether we want to go quite a few miles away with less competition in a retail location. Retail though is high startup. His office is in the Denver tech center, which is basically the equivalent of a downtown. Extremely less start up cost but no sign where people can drive by and see us, will strictly rely on marketing and no visible signage. We like retail cause you can drive by and see the sign and get in easily. Decisions decisions.