Superzoom lenses, which would you get?

I recently purchased the Sigma 18-300 and am quite satisfied with it. I was making up a lighter-weight kit for airline and bus travel, and for shore excursions during a cruise. Other lenses I considered were the Canon 18-135, Tamron 16-300, and the new Tamron 18-400. The best was probably the Canon, but I wanted more range. According to the second link below, the 16-300 has considerable CA at the long end. I knew little about the 18-400 and probably could not have gotten one before my September cruise. In any case the two Tamron lenses were much more expensive.

Here are some links:

https://lensvid.com …-vs-tamron-16-300-review/

Here is another link:

https://www.the-digital-picture.com …omp=0&FLIComp=0​&APIComp=0

And another:

https://www.pcmag.com …macro-os-hsm-contemporary

TeamSpeed wrote in post #18469377
I found the Sig 50-500 OS to be a very handy lens, with IQ that was pretty decent at both ends. For a 10x superzoom, that did pretty well.

I use that one a lot too.

CyberDyneSystems wrote in post #18468474
I can't vouch for any of the xx-300mm zooms, but I do far prefer the 18-135mm EF-S STM over the 18-55mm for similar reasons.

^^^^^This, but consider the 18-135 USM "nano" version.

Bassat wrote in post #18468549
I just bought an 18-135 USM. The optics are the same as the 18-135 STM,

Not true - if you believe photozone (http://photozone.de …_18135_3556stmi​s?start=2):


" The new optical design with a large diameter UD element in the front lens group obviously makes a difference compared to its predecessor. "

They gave 3.5 stars to the STM model vs 2 stars for the older model for the optical performance.