I have had 2 Equinox`s with the 1.5 & they were ok for me.
I just bought a 2.0 a month ago & really like the motor so far.
I was told that it will run ok on 87 octane & that is what I have been using.
It seems fine so far after 1600 miles.
Personally, I'd never buy a GM 4 cylinder. I'd opt for the 2.7 in a Toyota Highlander.
Why? There isn't anything special about a toyota 4 cylinder unless you think a lot of NVH is special. I had one for all of 12 months ('17 Rav 4, 2.5L). Less powerful, more thirsty and louder than my 1.5T.
2018 Chevy Equinox LT - Cajun Red, 1.5T FWD
2018 Chevy Sonic LT/RS - Red Hot, 1.4T
1994 Ford Mustang GT - Opal Frost (good weather fun car)