It depends on what you are doing. For office/lab space, twisted-pair (Cat6 or better) is really compelling. You can wire an office/lab space and support both

It depends on what you are doing. For office/lab space, twisted-pair (Cat6 or better) is really compelling. You can wire an office/lab space and support both 1- and 10-Gigabit connection. That being said, it's a good idea to do one of two things: 1. Run some fiber to a centrally-located faceplate in each space, with MT-RJ jacks (or something else, like LC). 2. Run a conduit (an inner duct) to each office/lab space, with a pull tape, so that fiber can be easily pulled through in the future. I personally prefer #2, for reasons like this: We have a few buildings with fiber run into offices/labs, but the fiber run was multimode. That's fine if you want to connect to a switch in the floor or building network closet, but it's not going to be compatible with the inter-building fiber, which is all singlemode.