Lens purchase - the agony of choice
As I have already written elsewhere, you should look at the lenses synonymous other manufacturers. I have selected three almost identical lenses from the focal length range here. I chose this as an example for the manufacturers' hyperzooms. These lenses are also called travel zooms or "always on shards". This is because they cover from the wide-angle range 18mm to the higher telephoto, here up to 300mm or the Tameron 270mm any focal length. In addition, they all have an image stabilizer and a built-in motor. At Nikon, the VR image stabilizer is called Sigma OS and Tamron VC.
I have commented on some of my lenses under Lenses.
Nikon AF-S DX NIKKOR 18–300 mm 1:3,5–5,6G ED VR
Sigma DC 3,5-6,3 18-300mm OS N/AF HSM Macro
Price ca: 470 Euro (as of 10/2017)
Tamron 3,5-6,3/18-270 DI II N/AF VC PZD*
18-270mm focal length
Price ca: 280 Euro (as of 04/2018)
*Meanwhile, there is still a 16-300mm from Tamron and 18-400
Now you are spoiled for choice!
It is good in forums or in tests to inform yourself about the quality and imaging performance of the lenses. Of course, the price also plays a role.
Here everyone has to decide for themselves which lens he uses.