I'm looking for a travel lens, multi purpose, light, good optics (not expecting great) and has powerful zoom. I narrowed my option to those two. I think the Nikkor has better Image Quality, but how much better from the Tamron? I don't know. Since I'm not seeing the 18-200VR Nikkor as a razor-sharp lens, more to it's great versatile utility. (I'm not trying to start a 18-200VR pros and cons thread). In the other hand, I heard the 18-250 Tamron has much improvement from the older 18-200 Tamron. So, if the Image Quality is arguably 'just' a bit lower, then with an extra 50mm and less cost, I would probably go with the 18-250mm Tamron. Anyone might help? Thanks before.