I've used my Tamron 90mm macro for portraiture, landscapes and architecture. It is a nice focal length that can be quite usable in many different instances.
Difference is, i dislike zoom lenses and therefore i don't use them very often. I carry a couple of prime lenses which is how i can incorporate the macro into everyday use. i.e. 17, 24, 35, 50, 90, 180, 300. I wont deny it weighs more and takes up more room than 2 zooms, but thats my preference, anyway the 17 --> 50mm primes are tiny & almost pancake like.