It was laggy from the first day of installon iphone & ipad, i had avoided chrome initially because safari was buttery smooth compared to chrome (i think i got on iOS around iOS 5).
then somewhere around late iOS 8 / early iOS 9, safari started having issues with loading pages during scrolling (you know, that issue with blank white space while scrolling down a page and takes a second before it loads that content). so at that point I gave chrome another shot and turns out they had worked on a lot of the issues and was a lot smoother. And on the ipad pro, it FLIES.
now on iOS 10, looks like they fixed the safari scrolling issue so i use chrome / safari about 50-50
(btw, if chrome still appears laggy for you, try clearing its cache every once in awhile. it can get a bit...bloated)