I have the Tamron 70-200 as well as the older 55-300. In the 70-200 range, there is zero doubt the Tamron is better IQ. It is also as heavy as a boat anchor. I only carry it when I already know I will use it, mostly when I'm in my car and not walking around. When traveling and packing a long lens "in case" some telephoto opportunity arises, then the 55-300 is much lighter, and more practical.
The 70-200 is so good, that for most photos, cropping the Tamron image to 300mm equivalent is probably going to give you a better image, assuming you don't want to print it 10 feet wide. But it's really not something you want to carry around in a bag or backpack.
But, the 55-200 does give nice, pleasing images for a lower weight, and a lower price, and the WR is sometimes just the perfect thing. Pentax WR is really good. Out in hurricaines, snow storms, blizzards, whatever. Just carry a dry towel in a bag and dry off the end of the barrel before zooming back in just to keep the little bits of water from coming into the lens, or to wipe off the mount if you are changing lenses. The biggest limit for the 55-300 is the slower aperture, which means it is less useful in dim light. In bright light, it is less of an issue.
Anyway, some samples from the 55-300 (full resolution on my flickr page, feel free to pixel-peep)
And some from the same time period with the Tamron 70-200.