Suddenly feel the need to put my 2 cents in....As a cleaning contractor, I feel I can give many convincing arguments for carpet.
Tile, while beautiful will require a great deal of maintenance. A tile floor needs to be:
1.swept,
2.damp mopped with a mild neutral floor cleaner, and
3.allowed time to dry.
If you are in a winter enviornment, you will also need to use a salt remover so the salt will not chew through the tile or the grout. Winter cleaning also calls for a "flood" mop, and then a damp mop to pick up as much of the salt and dirt as possible, or your beautiful tile will wear. You will also need to deep machine scrub the tile with a floor machine or have it done by a pro at least once a year to remove dirt and salt from the pores of the tile, or your floor will brown and become ugly.
The other option is to purchase a $7-$10K machine called an Autoscrubber to wash and scrub the tile every day. This machine is about the size of a shopping cart, and can easily cause damage to displays and drywall if handled like a dune buggy, which is the usuall way most of your staff will handle it (that's why I don't have one).
One other thing about tile is it has a terrible acoustic value. The theater in my town has tile and causes every noise in the place to bounce off the floor and into my skull, which in fact makes me hurry past the concession stand in hopes of finding sanctuary in the auditorium.
Now for carpet.
Carpet is good! You MUST CARE FOR YOUR CARPET!!! Proper care includes:
1. litter pickup(can be accomplished with broom and dust pan)
2. DAILY vacuum. Use a good quality upright. I use Electrolux uprights. I change the bags when 1/2 to 3/4 full, and use 3layer bags. HEPA is nice, but not really necessary IMO. A vacuum is not a race car and should be worked at a slow walking pace, or an arm's length back and fourth.
3. Stains- the sooner the better. I recommend buying a inexpensive upright hoover steam cleaner with a good quality carpet cleaning fluid to be used daily as needed for simple spot lifting(e.g. coke spill). I use a hand-held spot remover(dirt devil) for the small coffee stains, or spills on chairs, etc. It cost me under $100. My fee to pull out the big machine for a chair or spot is minimum 35 bucks.
4. Regular steam cleaning. DON'T rent a machine to do this. Most machines for rent are light weight and cannot pull up much water - meaning all of the dirt has just had a bath and is now home to many molds etc. Use a professional service, but be careful. The big name people are tempting, but most use a truck mounted system. This means they will need to drag about 300 feet of hoses through your building, bringing with them much of the dirt in the parking lot. There is also the security issue since the front door will need to remain open, so you will need to be present, or pay someon to stay around.
Shop around for the little guy with a portable machine. You will usually get better service, plus, you can lock him in or give him the keys=security. My portable machine can stand up to most of the truck mounts since I only run 25 feet of hose=no loss of suction. I pull 85% of what is put down, so no blowers are needed, and the carpet dries in about 8 hours average.
If you do get your carpets cleaned on a regular basis, say every quarter, the little guy may give you a rate break for the steady work(and mabey some passes) plus you may become his show piece.
If you have read all of this, you deserve a mars bar or something. I hope this gives you somthing to think about
The King