I find the 18-55mm STM lens to be quite amazing, light weight, very sharp, fast to focus. The 18-135mm also gets good reviews, but seems to be a bit less sharp, but of course gives quite a bit of additional range.
If you need a faster lens, then maybe consider the Sigma 17-50mm. I have the Canon 17-55mm/2.8. It works great at shorter distances (indoors) but gives autofocus errors at longer distances. It's a strange problem (see separate thread). So if you go for it, test it critically during the store's return period.
Me, I'm very satisfied with the humble but excellent 18-55 STM. I supplement it as necessary with the 10-22 and 55-250 STM.




