I am considering a jump from M1 to M3 for my wife because our daughter is looking for an upgrade.
Our daughter currently has a base MBP Retina 13-inch Early 2015 - 8 GB and 256 GB. She does not need anything fancy and because her system is getting long in the tooth, we were planning to trade-in her old system and then giving her my wife's M1 Air (also base).
The only reason I am considering M3 for my wife is because the base storage in M3 is now on par with M1, unlike M2 which were half the speed; otherwise, I would look for a deal for M2 Air. Given that we would go with base 8 GB for my wife, the storage speed might be a factor with page swap etc. Alternatively, we could go for M2 16GB/256 GB but at the end that config would be more expensive than M3 base, hence the most logical option is to go from M1 base to M3 base. She might also be interested in 15-inch model, but that is something we need to see in person; so if that would be the case, she would go from M1 base to M3 15-inch base.