90mb ram

If you're in a system where 256mb of RAM is the limit, sure - go for the RAM efficient OS options, they're out there.

Can you even buy less than 2GB of RAM in a desktop system anymore? Even the Raspberry Pi 5 starts at 2GB (and, yes, the older models have less, but I did say desktop system, implying: reasonable desktop performance.) Maybe if you feel the need to use a RasPi 3 as a desktop for something then you should dig around for one of your more efficient OS configurations, but I'll note... back when RasPi 3 was the new model, Raspbian came default without systemd, but offered a systemd option. The systemd option booted from power off to the desktop (such as it was) in about 1/3 the time.