the best grips are foam WCS grips. they unfortunately last 30 seconds.
I’m about 800miles into my current pair (at an average speed of 96,000mph).
They’re not more than 100g lighter than lock ons. They’re 36g without end caps – let’s say 40g.
Ruffians, which are pretty standard lock ons, are 108g.
Ruffians are much thinner though, the only lock ons I found even remotely comfortable were rogues, which IIRC were 140g (100g heavier than foam grips then).
It’s a personal preference though, I used lock ons for years, I used them before they were cool, when they were silly money before superstar started selling £10 copies, I carried on for ages because everyone else used them. Then bought some gusset B****** grips for the SS and realised that actually pretty much anything, even those, was better than lock ons (IMO).